Oh yeah, you know what? 5/5 on polish. Slow-down and stutter when killing or spawning enemies, the leaves falling, the trees in the wind. Excellent.
You should be a bit more careful with which entities are in front of which, and where the skull projectiles collide, sometimes I was in front of trees or behind houses, and my projectiles would explode on nothing.
But it was an atmospheric, pretty intense fight as-is. Good job!