Graphics need work, the style isn't bad, but you have other entity body parts overlapping the main character when you walk through them. Also, the background is very repetitive, try to mix it up a bit. I like the particle effects and camera effects when killing enemies but with only one type of attack it gets boring fast.
Enemies - hit boxes suck, giant squares, its easy but at least try to shape them a little bit so you don't die so easily when jumping over them. Also since certain enemies can attack, only kill the player or do damage WHEN they attack, touching them shouldn't kill you instantly in my opinion.
The... ending. The boulder threats and this cop stuff is such a meme and really kinda kills the game. I didn't like the ending, if the meme was your intention then cool but otherwise BOO