i agree with century, and add some music (maybe bertycox utopia), and maybe a boss level, make some levels any way cause it's getting borring with the same thing.
i hate when it ends, it's like a good book that ends it's like you have nothing for 2-3 seconds when returning to the real world, and you are still in heaven :3, but i want to keep going in the history lol.
but there one thing we can hope for to follow the history: WAIT FOR A SEQUEL. hope it's comming soon.
looks awesome, and for the comments that are complaining about this game: i would also put up a demo first, cause the genre looks pretty unique to me, so i think the demo is for the result if people would think this kind of a game is good.