Very interesting idea, the monster scared me a little.
For my taste, you could tweak the settings a little to make the character movement a little more fluid. I was running into walls and got stuck a few times. A label above the health and the ammo would have understood a little better what it was. I would love to see how much hp the monster has since I put 15 bullets into him and did not get any feedback other than I hit. And no! I do not suck =(
The soundtrack was really catchy =)