Missed this somehow. 

Love the old-school contrast on everything, I imagine animation would make important things pop out

amazing

#wouldplay

After looking at the mockup and seeing the stone in the bottom left I instantly said to myself. This reminds me of Helm's work.

I scrolled down and lo and behold, it was yours.

awesome.. I love climate of 'games' like this

love the yellow leaves, they offer a nice contrast to the greens. Great technique everywhere.

Is there a reason behind the heavy vertical divisions throughout the image? They feel out of place, and may hurt the flow of the piece overall. (Maybe that subconsciously is creating more clutter?) Anyway, still a really solid mockup!

I agree there's priority concerns, absolutely. Remapping would help, as would spreading out a lot of the foreground masked objects and the like. This is a very condensed mockup and I didn't really feel like fishing for the original layers to make one that would breathe. Just by taking away the foreground black leaves and most of the stumps etc at the bottom of the screen one would understand what's going on much better. Doesn't solve that those middle layer trees are too saturated and share too much space with the actual game character and his platforms, though. 

A very thorough readressing of the colors allotted to different layers would be needed.
 

Looked at it, wanted to comment that I love the colors, but for a game it most likely wouldn't work because the main character barely pops and it's total hard to identify where to go,

WOnder if it'd have the same problems if it'd be mapped out differently, and I still think some sissues would stay.

As picture you don't have to actually play it is quite pretty though and has nice atmosphere.

Oh, this mockup is great! Never like swamp levels in videogames. 

a lot of detail into this,really like it

I like the uber-density, to be honest. Makes swamp feel very old and overgrown.