Coming along well Tasty, I really like those layers in the background. The sky is really well done too.
I noticed a couple of graphic glitches, and arrow or two facing the wrong way or rock sticking out of the ground where it shouldnt towards the end of the second level.
(strictly my opinion again) but I think that shift is a horrible key to have as jump. (Using shift as jump reminds me of the days when we played shooters without the mouse and used ctrl to fire). Apart from the problem with sticky keys, its also a bit clunky - either you have to reposition your hand to be able to press shift button comfortably with your index finger (often leaving your hand in a position thats not ergonomic). The other option of course is for people to leave their hands comfy on the keyboard and use your little finger to jump. Either way - 10 mins into the game they will be feeling it.
This has turned into a major rant by now, but to me this is a vital basic to get right. Comfortable controls.