The ability to choose your character with the mouse would be pretty nice.
Also, can you remove the buttons in the background that go to the menu/character select while in play. They're hidden, but they are there.
Oh, and does it not make sense to have the sniper behind the helicopter, so that when he aims he has:
A: More Protection
B: An area to set up his rifle so that when he fires, he encounters less recoil?
 "Sky Island"){kind=icon}
 "Rebecca Whack: It's Friday"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Great Dungeon in the Sky"){kind=icon}
 "Epsilon"){kind=icon}
 "Great Game 1/5"){kind=icon}
 "VVVVVV Demo"){kind=icon}
 "REPLAYING :the game:"){kind=icon}
 "Weapon"){kind=icon}
 "Infectonator!"){kind=icon}
 "Frantic 2"){kind=icon}
 "Take Your Canvas Bags To The Supermarket."){kind=icon}
 "Vox Populi, Vox Dei(a werewolf thriller)"){kind=icon}
 "William and Sly"){kind=icon}
 "Hedgehog Launch 2"){kind=icon}
 "You Have To Burn The Rope"){kind=icon}
 "Frantic"){kind=icon}
 "Meat Boy (map pack)"){kind=icon}
 "Zilch"){kind=icon}