It was ok, just some problems though.....
It was fun for only the first 10 seconds, then it got really repetative, i know its not completed yet though, so i can understand that.
Also, i dont know if you would be able to do this because i'm a newb when it comes to flash, but you should reverse the aiming, when you bring the mouse down then the crosshairs go up, it would feel more natural.
The graphics were not very good (i shouldnt say much though, i cant draw very well!)
I've seen some real crap on newgrounds, and this isnt really as bad as most of those, it just could be beter, even for an unfinished game.