here's a tip: if you get the lightning arc things and put them behind you ship then you can catch any enemy ships which may get past. i used 2 fully upgraded, one in each corner for covering both sides
i reckon there should be alternative wepon pick-ups, also i think that their could be a 2 player version which might be good. if any body agrees just say
its ok but i think if they add some acheivements, use a spell checker and maybe add some more features then it would have the potential to be brilliant