Very cool game! As a swiss cheese and cat lover, I really loved the theme and the game idea. Additionally the art is gorgeous and I like the DOOM style health bar with the cat face :). Not sure if it is intended, but in my second game the mices in the scoring overlapped:
Did not happen in my first game. Not sure what I did differently. Additionally sound could be a bit louder by default. It is now much quieter than my other sounds on my PC. Of course I could turn it up in the settings, but I would maybe make the master volume already a bit higher by default.
I still had much fun playing this and made it to wave 8, with a score of 184!