Fantastic!!
I had minor issues, for example if the game lagged, I couldn't shot at all.
It would be cool if you could buy upgrades.
Selecting difficulty would be a great improvement too. For example:
Easy- You have more allied than enemy ships. Dumb AI.
Normal- You have as much ships than enemy's. Smart AI.
Hard- You have half the ships than the combined enemy forces. Smart AI.
Otherwise, it was great and I hope to see sequel!!!