Sweet game! I got to the fourth level. When I first started playing it, however, it started me on a very hard level.
This is a really creative game!
The interaction between the cats, dogs, and the bone is very neat. Reminds me a bit of the Wolf, goat and cabbage problem.
I feel like the cat herding mechanic could be developed to give more control over where the cats go. Maybe a hitbox shaped like a plow could do the job? It seems like they run directly away from the mouse pointer. Although, that is the behavior of cats when you try to herd them in real life.
Anyways, thank you for making the game, it was fun!