Beatstick to the face.
After playing the game about 20 times, I finally managed to get past the big FBI robot after he violated my face beyond repair. Plip! THUMP! Jump... Jump... Pli-THUMP! Pli-THUMP! For finishing this frustrating pattern of getting punched every time I suceed (Screw you, Pavlov!), I finally achieved my reward: an advertisement for the rest of the game! Cause, you know, I didn't like my alien teeth anyways.
Pretty sweet game, though. Very challenging to play until you get the swing of it. Very challenging to play after you get the swing of it.