I love games of this genre...
First off, to everyone who thinks this was stolen, I really don't think so. I have played enough games of this style and genre and I can say they all look pretty much the same and work the same way. The great thing about games like this is the super fast game play and action, how you need to use your mind and reactions to win... the simplicity of the game and controls that allow you to do so. This game is a rehash of everything made before it, it's not reinventing the wheel here.
That said, the game needs work, listen to what has already been said; a longer screen/playable area (I couldn't see far enough ahead to make any sort of defensive manuver), fix the kill glitches, maybe all the enemy ships shouldn't be able to shoot behind them or have homing weapons (what's up with that?) and can you even die? I don't think I took any damage. A boss would be nice too.