Good but not flawless
I really like the combination between rhythm and shooter, though it seemed as though the enemies shouldn't be able to hide under you while you're invincible. also, i agree that it didn't lag terribly, but i did drop a frame occasionally and with an 8800 gt for graphics, 2G ram, a 3800+ processor, i think there still might be a memory leak or something somewhere. very good overall though. keep up the good work.