I really like the art and visual of the game! The point that you guys managed to create so many different rats in this short amount of time is impressive! I found it really funny when I rest the rats, they just stop mid-air defying all physics logics lol xD. Ngl, this is one of the most creative approach to the theme yet it is done so well.
Some audio SFX would be nice so the players won't feel that boring and emotionless while playing the game. I personally feel the gameplay gets a little bit bland over time as its kinda repetitive probably I'm not that into this kind of idle games. Not too sure how to improve that part since you already introduce the risk of getting injured so players have to keep an eye on that from time to time but maybe still need some twist to make the game more engaging.
With that, it is overall very well made and you guys should be proud of yourself :D