A fantastic game.
I never competed level 11 but I checked out some of the other modes and wow. This is a awesome game! I like the way they are put together, the bosses that is and I think that if you kept it this way you could maybe make a "make your own boss" kinda thing? They would follow a template of the kinda things you have shown (crawler, large ship that transforms and so on). I loved it though. A online mode would be cool as well but i'm getting ahead of myself. xD