Performance update and bug fixes.

My first and probably only update for this game. Fixed a couple of bugs and made some improvements that I missed during the jam:
- Optimised culling mask to make the game a bit more performant
- Player position will reset when clipping through walls/ceiling/floor
- Final puzzle actually works
- Made the second room a little easier to figure out
- Lowered cat meow volume and set to 3D sound
- Music speeds up