Good start, but needs improvement
Fix the controls to work for right-handers. Try these keys:
A ( = 65 in ActionScript)
D ( = 68)
W ( = 87)
It might add more of a challenge to the game if you make the targets aggressive; i.e., they shoot back and you have to dogde. (S = 83, if you want to add a duck function.) A more visible font in the interface would be preferable as well.