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General strategy for getting lots of space stars (or at least how I got it): Max out upgrades. Pick up plane, go to bottom left corner, then throw quickly towards the top (try not to throw backwards). Immediately hold left and space, so you should fly close to straight up. When you have about ~1 bar of fuel left stop using engine. You should stall. Use emergency stall, now you're flying horizontal at some crazy high altitude and you can use the rest of your fuel to aim for stars.
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5 stars for gameplay, 0 stars for obscene racism. I'm only a couple of levels in and each time I think it can't get any more racist, it does! Extremely offensive.
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LOL. love the mystery upgrade. my first response to it: whaaaat??? transforming??? and then I'm a bouncy turtle bouncing along on the pavement. lol ouch
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After I read all the comments about throwing it backwards and crashing their internet browsers (some very bad for the actual computer) I got this hilarious thought of a high school student pranking his school's computer lab by playing this game and throwing the plane backwards on each and every computer in the lab and the just leaving them all like that. LMAO