Cool concept, and it looks great. The gameplay itself is pretty tough though. I wonder if locked the character's horizontal position together would help some in keeping everything manageable. Also I wonder if you could replace the jump with just using the gravity switch more. Definitely a solid start to a game and it has a lot of interesting potential.
(FYI: at one point during a gravity switch, my foxes collided in midair and stayed there. I was able to float through the middle of most the level like that. May be a bug but could also lead to a neat feature.)