Were the stickmen even needed?
The backdrops were good, why did you even need the stickmen in the first place? Stickmen always detract from the quality of a flash in my opinion. If you can draw the backdrops, seats and what not so well, couldn't you have done SOMETHING for the characters?
As for the concept? This has been done, many, many times. Also, you can cheat if you right click and press play right after you die. The concept is a dead one, very lame. Add some cover taking or health items and you MIGHT have had something.
Also, the game is buggy, I found myself several times shooting an enemy dead on in the head and have them not even be phased. This, combined with the rather unreasonable difficult and lack of gameplay, really hurt what could of been a great game.
Also, the sound effects were very dry. We were basically reduced to the same 5 or 6 sounds played over and over again. Next time add a couple screams of pain and maybe a bit of music or atleast SOMETHING.
Overall, it could of been a great game, but it turned out to be nothing remotely substantial. Nice try though, better luck next time.