loved it
Awesome game. I really enjoyed it.
Graphics were pretty good, nothing spectacular but they worked well for this game. Although at level 1 I was dodging the little black squares that were flying in the background because I thought they were the enemy bullets :). I was killing the enemies so fast that they didn't get the chance to fire so that's why I thought the little black pixels were their bullets :).
The "cards" idea was great. You could customize your ship the way you wanted though I think towards the end everybody gets the same 4 cards (if they know what's good for them :)). Nevertheless good idea that really spiced up the game.
The game got a bit laggy when there was ton of things going on and bullets flying everywhere but it didn't bother me at all. I liked how the hitting point for the ship wasn't that big so you could actually avoid the bullets even if the screen was filled with them. That adds the "skill" factor to the game which is very good. Makes me feel like I'm pwning with my godly evasion skills :).
If there's something to complain I think it was a bit easy. It didn't really get challenging until the last two levels. Even then I only lost one ship during the whole game and that was to the lvl 9 boss.
Overall awesome game. Great job!