diff --git a/build/assets/include/graphics.h b/build/assets/include/graphics.h
index 9c59b95..e0bc1cc 100644
--- a/build/assets/include/graphics.h
+++ b/build/assets/include/graphics.h
@@ -29,8 +29,8 @@ void image_draw_point(image_data_t image, int16_t x, int16_t y, image_color_t co
 void image_draw_hline(image_data_t image, int16_t x1, int16_t x2, int16_t y, image_color_t color);
 void image_draw_vline(image_data_t image, int16_t x, int16_t y1, int16_t y2, image_color_t color);
 void image_draw_line(image_data_t image, int16_t x1, int16_t y1, int16_t x2, int16_t y2, image_color_t color);
-void image_draw_rect(image_data_t image, int16_t x, int16_t y, uint16_t w, uint16_t h, image_color_t color);
-void image_fill_rect(image_data_t image, int16_t x, int16_t y, uint16_t w, uint16_t h, image_color_t color);
+void image_draw_rect(image_data_t image, int16_t x, int16_t y, int16_t w, int16_t h, image_color_t color);
+void image_fill_rect(image_data_t image, int16_t x, int16_t y, int16_t w, int16_t h, image_color_t color);
 
 #ifdef __cplusplus
 }
diff --git a/build/assets/index-itch.html b/build/assets/index-local.html
similarity index 100%
rename from build/assets/index-itch.html
rename to build/assets/index-local.html
diff --git a/build/assets/lib/graphics.c b/build/assets/lib/graphics.c
index 6b79659..433adf9 100644
--- a/build/assets/lib/graphics.c
+++ b/build/assets/lib/graphics.c
@@ -1,12 +1,13 @@
 #include <graphics.h>
 #include <memory.h>
+#include <stdint.h>
 #include <stdlib.h>
 
-static inline int max(int a, int b) {
+static inline int32_t max(int32_t a, int32_t b) {
     return a > b ? a : b;
 }
 
-static inline int min(int a, int b) {
+static inline int32_t min(int32_t a, int32_t b) {
     return a < b ? a : b;
 }
 
@@ -28,7 +29,7 @@ void image_free(image_data_t image) {
     }
 }
 
-static inline void set_point(image_data_t image, uint16_t x, uint16_t y, image_color_t color) {
+static inline void set_point(image_data_t image, int16_t x, int16_t y, image_color_t color) {
     image.pixels[x + y * image.width] = color;
 }
 
@@ -44,15 +45,15 @@ void image_draw_hline(image_data_t image, int16_t x1, int16_t x2, int16_t y, ima
         return;
     }
     if (x1 > x2) {
-        uint16_t temp = x1;
+        int16_t temp = x1;
         x1 = x2;
         x2 = temp;
     }
     if (x1 > image.width || x2 < 0) {
         return;
     }
-    x1 = max(0, x1);
-    x2 = min(x2, image.width);
+    x1 = (int16_t)max(0, x1);
+    x2 = (int16_t)min(x2, image.width);
 
     do {
         set_point(image, x1++, y, color);
@@ -64,15 +65,15 @@ void image_draw_vline(image_data_t image, int16_t x, int16_t y1, int16_t y2, ima
         return;
     }
     if (y1 > y2) {
-        uint16_t temp = y1;
+        int16_t temp = y1;
         y1 = y2;
         y2 = temp;
     }
     if (y1 > image.width || y2 < 0) {
         return;
     }
-    y1 = max(0, y1);
-    y2 = min(y2, image.height);
+    y1 = (int16_t)max(0, y1);
+    y2 = (int16_t)min(y2, image.height);
 
     do {
         set_point(image, x, y1++, color);
@@ -110,13 +111,13 @@ void image_draw_line(image_data_t image, int16_t x1, int16_t y1, int16_t x2, int
     }
 }
 
-void image_draw_rect(image_data_t image, int16_t x, int16_t y, uint16_t w, uint16_t h, image_color_t color) {
-    if (w == 0 || h == 0) {
+void image_draw_rect(image_data_t image, int16_t x, int16_t y, int16_t w, int16_t h, image_color_t color) {
+    if (w <= 0 || h <= 0) {
         return;
     }
 
-    w = min(image.width - x, w);
-    h = min(image.height - y, h);
+    w = (int16_t)min(image.width - x, w);
+    h = (int16_t)min(image.height - y, h);
 
     image_draw_hline(image, x, x + w - 1, y, color);
     image_draw_hline(image, x, x + w, y + h - 1, color);
@@ -125,14 +126,14 @@ void image_draw_rect(image_data_t image, int16_t x, int16_t y, uint16_t w, uint1
     image_draw_vline(image, x + w - 1, y, y + h - 1, color);
 }
 
-void image_fill_rect(image_data_t image, int16_t x, int16_t y, uint16_t w, uint16_t h, image_color_t color) {
-    if (w == 0 || h == 0) {
+void image_fill_rect(image_data_t image, int16_t x, int16_t y, int16_t w, int16_t h, image_color_t color) {
+    if (w <= 0 || h <= 0) {
         return;
     }
-    x = max(0, x);
-    y = max(0, y);
-    w = min(image.width - x, w);
-    h = min(image.height - y, h);
+    x = (int16_t)max(0, x);
+    y = (int16_t)max(0, y);
+    w = (int16_t)min(image.width - x, w);
+    h = (int16_t)min(image.height - y, h);
 
     while (h--) {
         image_draw_hline(image, x, x + w, y++, color);
diff --git a/build/build.ts b/build/build.ts
index f8e7a59..9438d75 100644
--- a/build/build.ts
+++ b/build/build.ts
@@ -12,7 +12,7 @@ await fs.mkdir(outDir, { recursive: true });
 const publish = process.env.PUBLISH_LOCATION;
 
 const args = process.argv.slice(2);
-const itch = args.includes('--itch');
+const local = args.includes('--local');
 let game = args.find(a => !a.startsWith('-')) ?? '';
 
 while (!await isGame(game)) {
@@ -22,7 +22,7 @@ while (!await isGame(game)) {
     });
 }
 console.log(`Building ${game}...`);
-const html = await buildHTML(game, { production: true, itch });
+const html = await buildHTML(game, { production: true, local });
 
 if (!html) {
     process.exit(1);
@@ -30,7 +30,7 @@ if (!html) {
 const filePath = path.resolve(outDir, `${game}.html`);
 await Bun.write(filePath, html);
 
-if (publish && !itch) {
+if (publish && !local) {
     console.log(`Publishing ${game}...`);
     const result = await $`scp "${filePath}" "${publish}${game}.html"`;
     if (result.exitCode === 0) {
diff --git a/build/html.ts b/build/html.ts
index b24b4b0..fa1c496 100644
--- a/build/html.ts
+++ b/build/html.ts
@@ -1,3 +1,4 @@
+import type { BunFile } from 'bun';
 import path from 'path';
 import { minify } from 'html-minifier';
 import UglifyJS from 'uglify-js';
@@ -10,17 +11,27 @@ import filePlugin from './filePlugin';
 
 import { getGames } from './isGame';
 
+const b64 = async (file: string | BunFile) => (
+    typeof file === 'string'
+        ? Buffer.from(file)
+        : Buffer.from(await file.arrayBuffer())
+).toString('base64');
+
 interface Args {
     production?: boolean;
-    portable?: boolean;
     mobile?: boolean;
-    itch?: boolean;
+    local?: boolean;
 }
-export async function buildHTML(game: string, { production = false, portable = false, mobile = false, itch = false }: Args = {}) {
-    const html = await Bun.file(path.resolve(import.meta.dir, 'assets', itch ? 'index-itch.html' : 'index.html')).text();
+export async function buildHTML(game: string, { production = false, mobile = false, local = false }: Args = {}) {
+    const assetsDir = path.resolve(import.meta.dir, 'assets');
+    const srcDir = path.resolve(import.meta.dir, '..', 'src');
+    const gameDir = path.resolve(srcDir, 'games', game);
+    const gameAssetsDir = path.resolve(gameDir, 'assets');
+
+    const html = await Bun.file(path.resolve(assetsDir, local ? 'index-local.html' : 'index.html')).text();
     const bundle = await Bun.build({
         outdir: '/tmp',
-        entrypoints: [path.resolve(import.meta.dir, '..', 'src', 'index.ts')],
+        entrypoints: [path.resolve(srcDir, 'index.ts')],
         sourcemap: production ? 'none' : 'inline',
         define: {
             global: 'window',
@@ -31,7 +42,7 @@ export async function buildHTML(game: string, { production = false, portable = f
             imagePlugin,
             audioPlugin,
             fontPlugin,
-            wasmPlugin({ production, portable }),
+            wasmPlugin({ production }),
             filePlugin,
         ]
     });
@@ -42,24 +53,24 @@ export async function buildHTML(game: string, { production = false, portable = f
             console.error('No entry point found:', bundle.outputs);
             return;
         }
-        const iconFile = Bun.file(path.resolve(import.meta.dir, '..', 'src', 'games', game, 'assets', 'favicon.ico'));
+        const iconFile = Bun.file(path.resolve(gameAssetsDir, 'favicon.ico'));
         let icon = '';
         if (await iconFile.exists()) {
-            icon = `<link rel="icon" href="data:;base64,${Buffer.from(await iconFile.arrayBuffer()).toString('base64')}" />`;
+            icon = `<link rel="icon" href="data:;base64,${await b64(iconFile)}" />`;
         }
         let style = '';
-        let styleFile = bundle.outputs.find(a => a.kind === 'asset' && a.path.endsWith('.css'));
-        if (styleFile) {
-            style = await styleFile.text();
+        let styleFiles = bundle.outputs.filter(a => a.kind === 'asset' && a.path.endsWith('.css'));
+        for (let styleFile of styleFiles) {
+            style += await styleFile.text();
         }
         const title = game[0].toUpperCase() + game.slice(1).toLowerCase();
-        let pwaIconFile = Bun.file(path.resolve(import.meta.dir, '..', 'src', 'games', game, 'assets', 'pwa_icon.png'));
+        let pwaIconFile = Bun.file(path.resolve(gameAssetsDir, 'pwa_icon.png'));
         if (!await pwaIconFile.exists()) {
-            pwaIconFile = Bun.file(path.resolve(import.meta.dir, 'assets', 'pwa_icon.png'));
+            pwaIconFile = Bun.file(path.resolve(assetsDir, 'pwa_icon.png'));
         }
         let manifest = '';
-        if (production) {
-            const pwaIcon = `data:;base64,${Buffer.from(await pwaIconFile.arrayBuffer()).toString('base64')}`;
+        if (production && !local) {
+            const pwaIcon = `data:;base64,${await b64(pwaIconFile)}`;
             const publishURL = process.env.PUBLISH_URL ? `${process.env.PUBLISH_URL}${game}` : '.';
             const manifestJSON = JSON.stringify({
                 name: title,
@@ -76,7 +87,7 @@ export async function buildHTML(game: string, { production = false, portable = f
                     type: 'image/png'
                 }]
             });
-            manifest = `<link rel="manifest" href="data:;base64,${Buffer.from(manifestJSON).toString('base64')}" />`;
+            manifest = `<link rel="manifest" href="data:;base64,${await b64(manifestJSON)}" />`;
         }
         let script = await scriptFile.text();
         const inits = new Set<string>();
@@ -106,8 +117,10 @@ export async function buildHTML(game: string, { production = false, portable = f
             scriptPrefix = `<script>${eruda};\neruda.init();</script>`;
         }
 
+        // function to avoid $& being replaced
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#specifying_a_string_as_the_replacement
         const resultHTML = html
-            .replace('<!--$SCRIPT$-->', () => `${scriptPrefix}<script type="module">${script}</script>`) // to avoid $& being replaced
+            .replace('<!--$SCRIPT$-->', () => `${scriptPrefix}<script type="module">${script}</script>`)
             .replace('<!--$TITLE$-->', () => title)
             .replace('<!--$ICON$-->', () => icon)
             .replace('<!--$MANIFEST$-->', () => manifest)
diff --git a/build/server.ts b/build/server.ts
index aa95834..3b5badf 100644
--- a/build/server.ts
+++ b/build/server.ts
@@ -21,8 +21,8 @@ Bun.serve({
                         game,
                         {
                             production: url.searchParams.get('production') === 'true', // to debug production builds
-                            portable: url.searchParams.get('portable') === 'true', // to skip AssemblyScript compilation,
                             mobile: detectedBrowser.mobile || url.searchParams.get('mobile') === 'true',
+                            local: true,
                         }
                     );
                     if (html) {
diff --git a/build/wasmPlugin.ts b/build/wasmPlugin.ts
index 51245c4..1a057e1 100644
--- a/build/wasmPlugin.ts
+++ b/build/wasmPlugin.ts
@@ -151,7 +151,6 @@ const wasmPlugin = ({ production }: WasmLoaderConfig = {}): BunPlugin => {
                         'nontrapping-fptoint',
                         'reference-types',
                         'multivalue',
-
                     ].map(f => `-m${f}`);
 
                     const flags = [
diff --git a/src/common/errors.ts b/src/common/errors.ts
new file mode 100644
index 0000000..5b933b9
--- /dev/null
+++ b/src/common/errors.ts
@@ -0,0 +1,18 @@
+export const formatError = (error: unknown, message: string = ''): string => {
+    const prefix = message ? `${message}: ` : '';
+    const suffix = (error && typeof error === 'object' ) ? (('stack' in error) ? `\n${error.stack}` : '') : '';
+
+    const errorMessage = formatErrorMessage(error).trim();
+
+    return `${prefix}${errorMessage}${suffix}`;
+}
+
+export const formatErrorMessage = (error: unknown): string => {
+    if (error && typeof error === 'object' && 'message' in error) {
+        return `${error.message}`;
+    } else if (error) {
+        return error.toString();
+    } else {
+        return 'Unknown error';
+    }
+}
\ No newline at end of file
diff --git a/src/common/game.ts b/src/common/game.ts
index 0d6632c..7bdfcd7 100644
--- a/src/common/game.ts
+++ b/src/common/game.ts
@@ -1,8 +1,9 @@
+import { formatError, formatErrorMessage } from "./errors";
 import Input from "./input";
 import { nextFrame } from "./utils";
 
 type Setup<T extends Record<string, unknown> | void> = () => Promise<T> | T;
-type Frame<T extends Record<string, unknown> | void> = (dt: number, state: T) => Promise<void> | void;
+type Frame<T extends Record<string, unknown> | void> = (dt: number, state: T) => Promise<T | void> | T | void;
 type GameMain = () => void;
 
 export function gameLoop<T extends Record<string, unknown> | void>(frame: Frame<T>): GameMain;
@@ -10,24 +11,39 @@ export function gameLoop<T extends Record<string, unknown> | void>(setup: Setup<
 export function gameLoop<T extends Record<string, unknown> | void>(setupOrFrame: Setup<T> | Frame<T>, frame?: Frame<T>): GameMain {
     return async () => {
         let state: T;
-        if (frame) {
-            state = await (setupOrFrame as Setup<T>)();
-        } else {
-            frame = setupOrFrame as Frame<T>;
-            state = {} as T;
+        try {
+            if (frame) {
+                state = await (setupOrFrame as Setup<T>)();
+            } else {
+                frame = setupOrFrame as Frame<T>;
+                state = {} as T;
+            }
+        } catch (e) {
+            console.error(formatError(e, 'Error in game setup'));
+            alert(formatErrorMessage(e));
+            return;
         }
 
-        let prevFrame = performance.now();
-        while (true) {
-            await nextFrame();
-            Input.updateKeys();
+        try {
+            let prevFrame = performance.now();
+            while (true) {
+                await nextFrame();
+                Input.updateKeys();
 
-            const now = performance.now();
-            const dt = (now - prevFrame) / 1000;
+                const now = performance.now();
+                const dt = (now - prevFrame) / 1000;
 
-            await frame(dt, state);
+                const newState = await frame(dt, state);
+                if (newState) {
+                    state = newState;
+                }
 
-            prevFrame = performance.now();
+                prevFrame = performance.now();
+            }
+        } catch (e) {
+            console.error(formatError(e, 'Error in game loop'));
+            alert(formatErrorMessage(e));
+            return;
         }
     }
 };
diff --git a/src/common/utils.ts b/src/common/utils.ts
index ca4051a..07297e9 100644
--- a/src/common/utils.ts
+++ b/src/common/utils.ts
@@ -1,4 +1,5 @@
 export const nextFrame = async (): Promise<number> => new Promise((resolve) => requestAnimationFrame(resolve));
+export const delay = async (ms: number) => new Promise(resolve => setTimeout(resolve, ms));
 
 export const randInt = (min: number, max: number) => Math.round(min + (max - min - 1) * Math.random());
 export const randBool = () => Math.random() < 0.5;
diff --git a/src/games/olc-run-2024/assets/figures.png b/src/games/olc-2024-run/assets/figures.png
similarity index 100%
rename from src/games/olc-run-2024/assets/figures.png
rename to src/games/olc-2024-run/assets/figures.png
diff --git a/src/games/olc-run-2024/assets/fill.ogg b/src/games/olc-2024-run/assets/fill.ogg
similarity index 100%
rename from src/games/olc-run-2024/assets/fill.ogg
rename to src/games/olc-2024-run/assets/fill.ogg
diff --git a/src/games/olc-run-2024/assets/place.ogg b/src/games/olc-2024-run/assets/place.ogg
similarity index 100%
rename from src/games/olc-run-2024/assets/place.ogg
rename to src/games/olc-2024-run/assets/place.ogg
diff --git a/src/games/olc-run-2024/assets/wrong.ogg b/src/games/olc-2024-run/assets/wrong.ogg
similarity index 100%
rename from src/games/olc-run-2024/assets/wrong.ogg
rename to src/games/olc-2024-run/assets/wrong.ogg
diff --git a/src/games/olc-run-2024/index.tsx b/src/games/olc-2024-run/index.tsx
similarity index 99%
rename from src/games/olc-run-2024/index.tsx
rename to src/games/olc-2024-run/index.tsx
index e4ce9b2..a90a94d 100644
--- a/src/games/olc-run-2024/index.tsx
+++ b/src/games/olc-2024-run/index.tsx
@@ -207,7 +207,6 @@ async function loop() {
         }
         rowsToClear.clear();
         colsToClear.clear();
-
     }
 
     display.clear();
diff --git a/src/games/olc-2025-shapes/index.ts b/src/games/olc-2025-shapes/index.ts
new file mode 100644
index 0000000..07248f4
--- /dev/null
+++ b/src/games/olc-2025-shapes/index.ts
@@ -0,0 +1,26 @@
+import { createCanvas } from "@common/display/canvas";
+import { gameLoop } from "@common/game";
+
+type State = ReturnType<typeof setup>;
+
+const setup = () => {
+    const canvas = createCanvas(800, 600);
+    const ctx = canvas.getContext("2d");
+
+    if (!ctx) {
+        throw new Error("Failed to get canvas context");
+    }
+
+    return {
+        canvas,
+        ctx,
+    };
+};
+
+const frame = (dt: number, state: State) => {
+    const { ctx } = state;
+    ctx.fillStyle = "blue";
+    ctx.fillRect(0, 0, 800, 600);   
+};
+
+export default gameLoop(setup, frame);
\ No newline at end of file