Uber Marsh is pretty good. I like the idea of giving both teams their own Coin Warp. 100 coins is a lot but there is enough to find for that which is good. It took me about 1-2 minutes to get the 100 coins.
The background in Layer 7 looks nice.
Eyecandy in Layer 4 & 5 is OK, could probably use some more.
A foreground might be a good thing to add to this level in Layer 1 or 2.
Overall, I quite like this level.