Interesting
Well there isn't much to this game at all. You should have the enemies spawn off screen not just randomly in the play field. Also maybe have power ups or something interesting. Put more into this game. Or just scrap it all together and just keep experimenting on new flash ideas and games. See which one really clicks with your group.
Maybe even add side cannons or something when things are close to the ground. People like challenges but if you make your character seem invincible, make the enemies seem even more so invincible. The point is, is to make the main item you are playing as fun to play with, and know that you have some serious power, and in the right hands or with enough practice you could get really awesome with it. Or even add different ships, maybe have one that shoots at angles, but does less damage. Possibly have more ships, and have them worth different points or score.
I hope this helps you, I would like to see something wonderful from your team,
ZombifiedMind