its very easy. my strategy-keep going around the original home bubble in a spiral fashion, thus making the difficulty steadily but not overwhelmingly increasing. it worked. i haf the beat game badge. chain makers, get a life. also, color spamming comments also get a life.
this game is very great, for those of you who don't know how to play it, stop complaining. a nice link that might help you is http://omegamario.newgrounds.com/news/post/160566 this game is incredible, stop complaining.
speaking of which, get the double turrets in stage 3, 3 of them, and you don't need to do anything for the rest of the game. 3rd stage is the hardest. all others are no problems at all.