Could be better.
I'll give you a 7 since this is your first flash game. A few problems though. A few of the target would appear and then vanish very quickly around .25 seconds. Hardly long enough to even get to the target. I have an IR mouse which atleast allows for speed and accuracy, however if the targets vanish so quickly, it's quite difficult to get it. I got about 21,385, give or take before I chose to end it. Still, other then that complaint, this is one of the best first entries I have seen in quite some time.