Love the concept, messing with gravity was one of my first obsessions in game design :D
Felt a bit ovewhelmed by all the stuff that was happening on screen. Perhaps start with a smaller level?
On the technical side, the camera movement felt a bit random and hard to control, and the characters were sliding way too much before stopping. As a rule of thumb, try to aim for very tight controls on platformers.
Great choice of art & sound, cute is definitely the way to go!
Keep it up!