[Knuckles]

Grass is OK, it needs some work.
Swamp on bottom.. You should use those other swamp tiles for the edges so it doesn't look like crap.
The waterfall looks kinda... strange.. Maybe move the top of it down alittle more.

AND, the level isn't great... HOWEVER.. I like it 'cause it's UNIQUE.
It doesn't look like all the other levels that you see on here =p.
Good job, nice idea, and nice layout.