I love the Commander Keen style game! The background at least on level 2 was a bit trippy, maybe think smoother backgrounds! The controls for PC was horrible, left alt for running and hitting (those are easy fixes though so no worries).
In level 2 you couldn't go through without cheating the jump bug that work when you just walk towards a wall and keep hitting space, you can jump infinitely. :D Since I couldn't jump on the platform that was going up and down, the clock didn't jump that hight.
Quite a nice idea though, polish it a lot and you might have quite a nice game on your hands! :)