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Hmmm it's not that hard. First, do what the other guy said and get 10 speed power-ups first, then get all armor after. Now the key here is, you restore hp and grow if you use YOUR asteroid to destroy a ship(not your allies). With that in mind, on the last level, let your allies wander free and destroy ships on its own while you too try to destroy ships. This works very well because those ships will aim all over the place, not directly at you, so you can go behind and kill them all for hp. Go for huge red mines to protect your allies and avoid green and blue at all cost. (If you do well, you can get well over 1000 hp)
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lol tried again and killed 9129. To get the first hard badge you circle around the edges while flinging your buddies everywhere, getting massive hp. I got around 2000 doing that avoid green and blue mines, unless you are too big to dodge them. When all your allies die, you lose too, pretty much.
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... I got speed run. first time. No cheating. It wasn't very hard :P Just take 'grow' for every single powerup and use headacher's tip to take speed... Wait... That might be cheating :P
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The small enemys are invisble and can't attack. Sometimes the controls refuse to do their work. Now I'm in level 13 and the games crashed down. Simply not funny.