That was fun =D
The layered background in the forest was a nice touch - not totally realistic, but interesting xD
I kind of expected at least one flying level, though ^^u Maybe that would have been the next one given more time?
The fresh-out-of-water level (second one) featured platform leaves and background leaves (for the worms). It would be a good idea to distinguish between them more, so that it is easier for the player to quickly distinguish what could be landed on in the middle of a fall. Right now, they look much too similar, and I have fallen through a worm-leaf more than once =9