Pretty fun idea with a very unforgiving scaling... unless you manage to get 3-4 Magnets and a lot of mouse-spawning, and then the game transforms into an idle game XD
Overall, pretty cool, but I've found myself AFKing just to wait for all mice to appear before I could shoot my cat-roomba. Maybe making the spawn rate faster would be better? Though I'm not really sure, I played an idle version of this anyway XD