Hint: I found you can combine your special charge powers together to make even more powerful ones!
-Fire+lightning= Explode
-All powers collected together= Chaos
Those are all the ones I found so far, but they are really cool.
hmm... When I picked up a special charge attack (lightning) and then picked up another special charge attack after defeating the next boss, I got a completely different one called chaos. Is this a bug or intentional?
 "City Siege 3: FUBAR Level Pack"){kind=icon}
 "Reactor Incremental"){kind=icon}
 "Mutilate-a-Doll 2"){kind=icon}
 "The Last Stand: Union City"){kind=icon}
 "GrindQuest Censored"){kind=icon}
 "Strike Force Heroes 2"){kind=icon}
 "Caravaneer"){kind=icon}
 "Warfare 1944"){kind=icon}
 "Canabalt"){kind=icon}
 "Scene of the Crime: Dream of Murder"){kind=icon}
 "Hordes and Lords"){kind=icon}
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Like many other things in the game, just throw it at your target.