Long time since I saw some sidescrolling 3D platformer, and this is very well done: nice backgrounds, the right music, character seems cute and the enemies fit. At time shadows are a bit overwelming and the camera feels a bit jumpy, or the movement stiff, but those are minor problems easy to iron out after the jam.
Find something to keep the player interested (a original mechanic, a compelling story), and you can build a game where people would gladly sink some time, nice work!