very cute, nice gameplay.
I would say for the very first level, you shouldn't be introducing 3 cats in the same level. Because you're trying to communicate in this level that
1. To win you need to fill up all the boxes
2. cat 1 does this
3. cat 2 does this
4. cat 3 does this
Personally I think that's 4 different levels in a discovery puzzle like.
But this game has a nice foundation, hope to see the progress in the future.