Really cool game, the lighting looks very nice :)
Neat shrink/grow mechanic too, fun to play.
Only critique is concerning the movement, it seems like you can't jump unless you are mostly on solid ground.
I'm guessing you're checking for the floor with a raycast centered on the character pointed down?
Maybe add a second raycast and put them at the left and right edges of the player pointed down so you can jump any time you're on a ledge.
I may also be completely wrong about how you're detecting the floor :D
Just a thought, it's really solid game!