Cool game. I like the art and the music. I think it would be cool if the camera moved slightly in the direction the player is looking so you could see further in front of you but less behind. I also think the game needs a bit more impact - like sound effects when you hit enemies, screenshake, particles - things like that really help the game feel a lot better. I liked the levels, were they procedurally generated?
I actually made a similiar game, would be cool if you checked it out. Also I'm interested in how you did the procedural generation (if the levels are generated)