Controls...
This is a fun game, it really is so I to be so harsh on it and give it a 6, but I feel that because its a fun game and has the potential to be so much better that I have to be harsh.
The controls. Fix them. The concept, levels, and just design of the game are fun but I going crazy here when I'm in the middle of dodging a bullet storm and all of a sudden the controls become unresponsive for a split second and my ship now stops moving and destroyed. Or even better, it moves when I press the arrow key but then proceeds to fly to the opposite end of the screen despite me having only tapped it.
Its a good game, but in a game like this where split second response time is necessary you have to have controls that are accurate and responsive dude. Until that happens this games just going to be more frustrating than fun.