VVVVVV is a retro styled 2D platformer by Terry Cavanagh, creator of dozens of free games. You play as the fearless leader of a team of dimension exploring scientists who inadvertently crash, and are separated. The game involves exploring the strange world you've found yourself in, and reuniting your friends. VVVVVV explores one simple game mechanic: you cannot jump - instead, you reverse your own gravity at the press of a button. The game focuses on playing with this mechanic in a variety of interesting ways. The game is designed not to artificially gate your progress. In VVVVVV there are no locks, no power-ups, no switches, nothing to stop you progressing except the challenges themselves.
This game is awesome!
Picked it up with the HiB4 bonuses and good grief is it crazy challenging and crazy fun, wonderful 2D platformer that runs fine on Linux!
Hopefully HiB4 will get Desura keys soon for all of its games so that I can attach them all to this. ;D