This is a pretty neat idea. I think it would be helpful for the flow of the game and picking up the mechanics to start with some simpler levels (i.e. a level where you just have to walk to the crystals, then one where you have to jump up stairs, then one where you have to walljump, etc.). Also, it would be nice to have WASD bound for controls as well. I find that a lot more comfy than the arrow keys.