Great game!!!!
Now for a more critical comment:
high score + your score at the end of the game was bugged for me, showed 0 in both; I quickly stopped having things to spend my coins in, upgrading nipples and beds for speed and not only quantity could be a fix so you have something else to spend money in; I found the fact that you can choose how many cats to adopt at any given point takes some of the challenge away, I played twice, the first one I adopted every cat at the beginning and lost pretty fast, the second one I took my time and it was dead easy, some middle point would be nice; one more task (like playing with something or a scratcher, whatever) could also help in doing the game a little more challenging. As other user said, the box triggers are a little finicky, I usually had to throw a cat twice to hit the boxes.
Nice work!!!!