diff --git a/build/assets/include/linalg.hpp b/build/assets/include/linalg.hpp
index b900320..de26bd8 100644
--- a/build/assets/include/linalg.hpp
+++ b/build/assets/include/linalg.hpp
@@ -495,6 +495,7 @@ namespace linalg
     template<class T, int M> T           uangle   (const vec<T,M> & a, const vec<T,M> & b)      { T d=dot(a,b); return d > 1 ? 0 : std::acos(d < -1 ? -1 : d); }
     template<class T, int M> T           angle    (const vec<T,M> & a, const vec<T,M> & b)      { return uangle(normalize(a), normalize(b)); }
     template<class T> vec<T,2>           rot      (T a, const vec<T,2> & v)                     { const T s = std::sin(a), c = std::cos(a); return {v.x*c - v.y*s, v.x*s + v.y*c}; }
+    template<class T, int M> constexpr vec<T,M> reflect  (const vec<T,M> & i, const vec<T,M> & n)      { return i-2*dot(n, i)*n; }
     template<class T, int M> vec<T,M>    nlerp    (const vec<T,M> & a, const vec<T,M> & b, T t) { return normalize(lerp(a,b,t)); }
     template<class T, int M> vec<T,M>    slerp    (const vec<T,M> & a, const vec<T,M> & b, T t) { T th=uangle(a,b); return th == 0 ? a : a*(std::sin(th*(1-t))/std::sin(th)) + b*(std::sin(th*t)/std::sin(th)); }
 
diff --git a/src/games/playground/awoo.cpp b/src/games/playground/awoo.cpp
index 31c0c5d..a301247 100644
--- a/src/games/playground/awoo.cpp
+++ b/src/games/playground/awoo.cpp
@@ -4,8 +4,9 @@
 using namespace linalg::aliases;
 
 EXPORT(main) auto init() {
-    double2 dir = {0, -1};
-    double2 rot = linalg::rot(3.14 / 2, dir);
+    static constexpr double2 vel = {-1, -1};
+    static constexpr double2 left = {1, 0};
+    static constexpr double2 refl = linalg::reflect(vel, left);
 
-    return linalg::angle(rot, {0, 1});
+    return refl.y;
 }
\ No newline at end of file