i managed to beat the badge by getting only speed powerups.
on the last level fly around a bit then hold down the mouse, your allies will fly around really fast, killing loads of enemies and taking the damage from the bullets. you can then ram into the enemies left and make yourself bigger and concentrate on hitting the red mines. i got almost 10 000 kills by doing this.
oh, and you dont have to use allies to kill the anti-gravity enemies with this technique
i beat the badge second try, i dont get why you find it hard.
this game is like a tweaked version of the gameboy advance game kuru kuru kuruin, that game is great...
if you get the armour crash into as many mines as possible, you get 500 points for every mine you destroy.
this is stupid, in my team i have 5 robots, each can 1 hit kill any robot and has half-decent shielding (but doesn't need it). my team weighs 145. the last level is easy like this
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 "rotaZion"){kind=icon}
 "Streamline"){kind=icon}
 "Runes of Shalak"){kind=icon}
 "Bot Arena 3"){kind=icon}
 "Blue"){kind=icon}
 "Luminara"){kind=icon}