Cute game! I managed to discover all the cats. It seems the checkerboard one took the longest to show up. It seems like I had to spawn at least one of each other cat type for it to show up (I'm not sure if that's what triggered it, but I tried that and it seemed to have worked). The car cat was probably my favorite one both stat and design wise. I do like the art and the variety of cat and enemy types that were made. A potted plant being among the animal enemies I thought was funny.
I do wonder if the arena is a bit too long. When I'd move the camera back and forth, there would be long stretches of little or nothing going on. A lot of the action seems to gravitate towards the left and right sides of the arena.
After playing the game for a bit, I noticed all the sounds eventually stopped playing. I experienced a similar bug with another game in this jam as well, so I'm not sure if it's something on my end or it's just a coincidence. I'm curious if anyone else experienced this or it's just me.
Anyway, cute game! Nice job!