keep praciticing
It is obviously a shooter. It's good that I'm able to tell that.
Graphics: You need to put a lot more work into graphics. If you draw a lot you'll get better at it. Try looking at how other people's games look.
Sound: The gunshots sounded like banging on a trashcan with a stick. Work on that.
Interactivity: As much as you would expect from a shooter.
Style: You need some style.
Violence: Some progressive damage effects would be better. There's a tutorial for that at this website.
humor: I laughed a little, but I don't think I was meant to.