Hmm.
Not too bad for a first game to be honest. But I'm still going to be as strict as I normally am.
Okai, first of all, it'd be cool for some instructions, I thought that the guy was me for a bit. (7) Now, stick people are alright, but generally not good for games like this. (5) the music was cool, but a mute button would be better for people who don't like that kind of music (Not me, but I'm not talking about me) (3) I'll give you 3, and not scrutinise any more.
Tips:
1. No stick men! Learn to draw real people!
2. Make a crosshair or something
3. Make a gun or something on the right-hand-side of the screen,
4. Vary it a little, make more people etc.
5. Have levels, makes it more fun
6. More backgrounds :D
Good luck with your future stuff.