Cool game, but it went from ridiculously easy to ridiculously hard during the last couple of levels. Some challenging-but-not-frustrating levels in between would be good.
If you're having trouble with the last couple of levels, get all the Twister upgrades you can get, the Critter and Reloading kit, and just don't miss an active reload ever. You will kill fast enough that there won't be more than 2 people on screen at the same time.
Just add a laser and any two other things in each floor and the game plays itself. Also excessively laggy for a game with this low / stylized graphics. Nice idea, poor execution, 3/5.
 "Defend your Honor!"){kind=icon}
 "Reactor Mobile"){kind=icon}
 "Soccer Balls"){kind=icon}
 "The Final Death Wish"){kind=icon}
 "Hello Worlds!"){kind=icon}
 "Shopping Cart Hero 2"){kind=icon}
 "Mushroom Madness 2"){kind=icon}
 "Dead Frontier: Outbreak 2"){kind=icon}
 "Dream World"){kind=icon}
 "VVVVVV Demo"){kind=icon}
 "Weapon"){kind=icon}
 "The Codex of Alchemical Engineering"){kind=icon}
 "Huje Tower"){kind=icon}
 "The Next Floor"){kind=icon}
 "Cyclomaniacs Guide"){kind=icon}
 "CycloManiacs"){kind=icon}
 "Gravitee 2"){kind=icon}
 "the big red button"){kind=icon}
 "Super Stacker"){kind=icon}
 "Shore Siege!"){kind=icon}