and a new demo, mainly to test the parallax effect, really jittery, , no transitions, player controls are not pleasant = lots of things to do ^^.
If I take your "woods" area, you have got 3 different layers, right ? One with the ground, another one with the bushes, and then the hills, right ?
I notice that bush-vs-ground parallax doesn't work: it just make the bushes "flicker" as if they were updated later due to an engine glitch rather than being something parallax.
I'd have had "hills-vs-ground" parallax more pronounced, too, given the respective size of the objects. But that one could be just a matter of taste.
That being said, neat art. Not everything is the way I'd sponsor it, esp. in the "sand zone" where you look less comfortable yourself with your drawing ... but I wouldh't reach 20% of that skill level myself, so I won't try to point out specific "errors".