Hmm...
Not bad, the game had my attention for quite a while. Just take it further! This could easily be the next -Frantic- or major game along those lines, but you just need to really up the gaming experience. It was fun for a while, but the weapon upgrades got boring and it started to seem, slow. Not as in performance, but as in activity. It didnt keep my attention for a while. You have some good programming skills, just take a while and make a game that really would keep someone occupied for a good long while. Make in-game achievements, level selects, weapon upgrades, different ships, etc. You've got it going fo you, just build on it.