Cute graphic design, simple but appealing and cozy. Music can multiple the atmosphere, wish it be there.
Nicely implemented platforming movement control. One of the best I've tested so far here on jam. Maybe variable jumping height will even add to it, maybe not, I'm not sure. In a dangerous underwater corridor I wish I have better control over character vertical movement.
In some places passage between screens is not very convenient, crosses the character, it would be better to just move on the boundary between screens, not interrupt movement by standing on platform. But it's minor.
I didn't understood cat throwing mechanic well because of lack of cats. I found only one when wondered almost all over the world and throwed it to nowhere to just lost without any purpose.
I'd wish to see in advance the danger in the water. However, it's minor because the damage is relatively small.
The most thing I missed after some time is answer to "what am I looking for? why do I wander here? what is my goal?". It would great to know the goal somewhere near the begining.
Nevertheless wandering is pleasant thanks to nice variable backgrounds. Map could be very helpful also because the world is quite big.
In general, great start, I wish to see it as a full game! My children also liked the setting.