The cats are very cute and it definitely highlights the issue of not neutering cats being a problem.
It would be nice if there was a point at which the game failed you if there are too many cats, as the cats just seem to grow exponentially and i was a little worried for my CPU. I also noticed that the game timer will keep going into negative numbers when it reaches 0.
This is looking pretty good for a game made in 3 days though, good job!