Really liked the game-play and the visual presentation! An idea: you could add some bullet hell elements to this game. I'd love to see how dodging a ton of bullets looks like from this perspective!
More bullet hell, on the list Now DS is out, Eli was kind enough to open another thread over at http://forums.toucharcade.com/showthread.php?t=275807. Add comments and stuff there and I'll be sure not to miss them!
