You have just got to try VVVVVV!!!
The demo can be played in your browser here: http://www.kongregate.com/games/TerryCavanagh/vvvvvv-demo
If like me, you become totally addicted to the sheer simplicity of the game’s dynamics, then it can be purchased from:
Don’t have Linux? Oh well you suck. You can however play the whole game @ Kongregate for 50 Kreds or the game is queued for future release on the Nintendo DS.