Looks like a beginner game and not bad for one.
Graphically, I would stay away from stretching my images like that, use individual tiles or something like that.
Gameplay-wise, I say make the camera a little bigger so I don't have to do blind leaps into the abyss :D
Also the character should fall down faster, it feels unnatural for him to fall down that slow.
Also maybe add fall damage to punish skipping down all the way to the end of the level.