Alright
It's not great, but it's certainly good for a first attempt at a flash game.
Suggestions for improvement: Graphics could use a little work. They're actually fairly good, but next time you might try animating the targets instead of having the JPGs just glide across the screen. The game-play is also a little too easy and probably needs to be worked on a little - for example, maybe an ammo limit, or reloading time after every 6 shots or something. As it is right now, you can pretty much just go crazy clicking and never miss anything.
Aside from that though, this was a pretty solid submission, and great for a first flash game. Nice job.