Fix Sprite2D rendering with alpha

src/Shaders/sprite2d.fragment.fx

@@ -4,7 +4,7 @@ uniform sampler2D diffuseSampler;
 
 void main(void) {
 	vec4 color = texture2D(diffuseSampler, vUV);
-	if (color.a == 0.05) {
+	if (color.a < 0.05) {
 		discard;
 	}
 	color.a *= vOpacity;