Hey, good game!
Feedback:
1. You can get stuck on one kind of cat for a while - like if I get stuck on the purple and orange cat, but I need the black cat - it gets boring and frustrating (I guess I am just impatient).
2. Sometimes the black box just flies off into the void when I crash into it with a purple cat (maybe due to high speed).
(this should help if you plan to improve upon the project further)
If you have some spare time, please consider playing my game and providing feedback, that'll help me improve as I am considering building it out into a full game.