diff --git a/src/drawables/shapes/circle.ts b/src/drawables/shapes/circle.ts
index ea352bf..9d27426 100644
--- a/src/drawables/shapes/circle.ts
+++ b/src/drawables/shapes/circle.ts
@@ -7,7 +7,7 @@ export class Circle extends Drawable {
     sdf: {
       shader: `
           uniform vec2 circleCenters[CIRCLE_COUNT];
-          uniform vec2 circleRadii[CIRCLE_COUNT];
+          uniform float circleRadii[CIRCLE_COUNT];
 
           void circleMinDistance(inout float minDistance, inout float color) {
               float myMinDistance = maxMinDistance;
diff --git a/src/graphics/graphics-library/program/fragment-shader-only-program.ts b/src/graphics/graphics-library/program/fragment-shader-only-program.ts
index 3647083..a08a7b6 100644
--- a/src/graphics/graphics-library/program/fragment-shader-only-program.ts
+++ b/src/graphics/graphics-library/program/fragment-shader-only-program.ts
@@ -7,7 +7,9 @@ export class FragmentShaderOnlyProgram extends Program {
   private vertexArrayExtension: any;
   constructor(gl: UniversalRenderingContext) {
     super(gl);
-    this.vertexArrayExtension = enableExtension(this.gl, 'OES_vertex_array_object');
+    if (!gl.isWebGL2) {
+      this.vertexArrayExtension = enableExtension(this.gl, 'OES_vertex_array_object');
+    }
   }
 
   public async initialize(
diff --git a/src/graphics/rendering/shaders/shading-fs.glsl b/src/graphics/rendering/shaders/shading-fs.glsl
index c519ead..f54aa70 100644
--- a/src/graphics/rendering/shaders/shading-fs.glsl
+++ b/src/graphics/rendering/shaders/shading-fs.glsl
@@ -18,7 +18,7 @@ in vec2 uvCoordinates;
 
 uniform vec3 ambientLight;
 
-vec3[colorCount] colors = vec3[](
+vec3[{colorCount}] colors = vec3[](
     {palette}
 );
 
@@ -36,7 +36,7 @@ float shadowTransparency(float startingDistance, float lightCenterDistance, vec2
     float rayLength = startingDistance;
     
     for (int j = 0; j < SHADOW_TRACE_COUNT; j++) {
-        rayLength += getDistance(uvCoordinates + direction * rayLength);
+        rayLength += max(0.0, getDistance(uvCoordinates + direction * rayLength));
     }
 
     return min(
@@ -57,7 +57,7 @@ float shadowTransparency(float startingDistance, float lightCenterDistance, vec2
     in vec2[CIRCLE_LIGHT_COUNT] circleLightDirections;
 
     vec3 colorInPosition(int lightIndex, out float lightCenterDistance) {
-        lightCenterDistance = distance(circleLightCenters[lightIndex], position);
+        lightCenterDistance = max(0.0, distance(circleLightCenters[lightIndex], position));
         return circleLightColors[lightIndex] / pow(
             lightCenterDistance / circleLightIntensities[lightIndex] + 1.0, 2.0
         );
@@ -98,7 +98,7 @@ float shadowTransparency(float startingDistance, float lightCenterDistance, vec2
         return intensityInDirection(flashlightDirections[lightIndex], positionDirection) * 
             flashlightColors[lightIndex] / pow(
                 lightCenterDistance / (flashlightIntensities[lightIndex] * INTENSITY_INSIDE_RATIO) + 1.0, 2.0
-            );
+            ));
     }
 #endif
 #endif