nice game.
Great game. A few things to improve upon:
1. when moving left to right perhaps make the ship title to its respective angle.
2. Most shooters give a little room between the wings and the cockpit before damage is dealt. Of course, you have the shield option so perhaps that is not your preference.
3. Even if you don't like suggestion 2, I had a hard time figure out when I was hit if I had any play like the option I suggest in #2. Perhaps, a sound or a graphic which illustrates the damage I am taking?
4. Some backround music would be nice.
All told, I enjoyed the game and definitely will returnt to it when I am not at work. ;)