The art is nice, but not very well implemented. The main character looks grainy (pixely? I don't know how to describe it. I looks like it was resampled down with low quality settings) and there are some stretched textures on platforms that look really out of place. Is this your art or are you using free stuff? Some of the oversights are a little odd, that's all. The gameplay is pretty basic, which is fine, and the controls are alright. However, the platforming is poor, because it's difficult to see where you're going to land. Like Steven said, lowering the camera would help a lot. As it is now, it's awkward and claustrophobic. Also I wish there was some sound effects. Hitting enemies feels very weak, so a simple punch sound effect would really help with that.
Otherwise, the art is well drawn and the concept is solid for a platformer/run n gun game. Just feels very unpolished.
I feel like I've written a harsh comment, but I think the art is throwing me off. If it IS your art, then congrats on that. Work some more on the gameplay next time, though.