Good art style and music, but I have some issues with the game design here:
Having only a-d to move, and not also being able to use the arrow keys was a bit frustrating.
Using the space bar with A and D is also a bit awkward.
The jumping was very stiff, since you couldn't adjust after jumping, and some of the jumps were very finicky, which wouldn't have been so bad if not for having to restart from the start.
It would have been better not to reset the music with every death, also.