Fun concept, cute cat assets. I like that you can choose different cats and audio. Sensible and satisfying scoring system.
A couple of adjustments I'd suggest:
- for the free camera, it would be more intuitive to rotate it from the player's perspective. Currently the world is rotating in the same direction as the mouse rotation, but if you want to simulate the player turning their head, it has to rotate in the opposite direction.
- explosion sound can be toned down in its volume. It is significantly louder than the other sfx and bgm.
Nice work!