Hmm...where have I seen that type of idea before...
Hahahahahaha. Just kidding, I'm sure it's a fairly common idea...
Anyway, I love the look of the checkerboard platforms, it seems as though Icegoom himself made it. Also, the forest level looks amazing, I especially like the veridian palette of the canopy, and the undergrove is a very interesting touch, even though I've seen it many times before.
But may I suggest adding a more detailed BG for the desert level, it's pretty generic from what I can see...
Good luck with whatever you're doing next!