Potential.
The game has potential. The overall graphics could use some major work. Your ActionScript shooting engine was horrible. The missle follows your mouse position even after being shot. Instead of having the missles _x and _y position the same as the guns _x/_y position save the angle of the gun into a global variable and call upon it when the missle is shot. Search the BSS, denvish wrote a very nice tutorial on this. Overall it was a valient effort; could use some work.