Very nice artwork, animation and super (creepy) music!
I felt ported back in time to my first PC and the Commander Keen games :D
The only problem I had was with clipping, sometimes I got stuck moving in the same direction (as in: unable to move forward, until I jumped first) and one time I fell through the floor:
(you see me getting smaller and smaller... or rather being squished more)
I think this happened around here, when falling down from the platform above:
But all in all: awesome work!
Please keep making games (and extend this if you like ;)