Swamps are OK. But I fear the designs of each one is going to be too similar and that each level will not have as much unique areas different than each world.. But I could be wrong.. xD
In the snapshot, it was just a basic theme with similar platforming elements as the Jungle and that's all.. Though I could be taking it too far..
I did like the art-work. It looks much more natural, the mountains are slopes in that, etc. Haha