The art was nice indeed. I found the character controller to be a bit quick, and I was having trouble understanding what was killing me a few times.
I really liked the environment. The music matched really well. I also liked how you tied in the random switching of keys intermittently. It made it pretty challenging, but oftentimes, I found myself just waiting it out. Maybe a timer, to force the character to keep moving?
One other note, the length of the level was a bit unforgiving. A few checkpoints along the way would have helped. Starting from the beginning hurt my heart.
Those things aside, this was really well done for 3 days work. Excellent job!