Simple enough, but glitchy and boring
It's pretty fun, but there are a major glitches.
First is that you can jump from below a floor and go through it, thus landing on top. Judging by your level design, I'm guessing this wasn't intended. The game is a lot easier if you utilize this.
Second, and much more major: sometimes, when jumping and landing somewhere, you become unable to walk. You can only jump out of it. A lot of the time, it's the result of jumping up to a higher level, then back down to the bottom. It makes it a LOT harder to play.
Aside from the glitches, it has no powerups, only one song, no bosses (that I reached: I got to level 4) and no checkpoints. It gets pretty boring pretty fast, but for about 1 minute, it's somewhat fun.