Solipskier was a 2011 IGF Finalist -- in the mobile games category, and it is available for iOS and Android, but there's also a free Flash version you can play online.
It's a rapidly-moving sidescroller in which you "draw snow" that a little skier skis on, gaining speed on downslopes and losing it on upward ones, doing jumps if you draw a steep upslope. If you lift the mouse button (or your finger in the mobile touch version), the snow goes away -- which is fine if your skier is jumping, as he then does 'tricks' for additional score points, but not so fine otherwise, as he will then plummet to his death (game over, obviously).
You gain score by passing through blue gates and speed through yellow gates; speed increases your multiplier. There are occasional gaps where you cannot draw snow, which the skier must jump over; and red gates will instantly kill the skier if you don't avoid them. Indicators at screen right indicate oncoming gates and gaps, with numbers counting down the distance.
It's the kind of game you play mainly to hit a personal high score, a style reminiscent of the arcade. Gates and gaps are generated algorithmically, so the game can in principle be played infinitely and is not identical each time you play; it's not a deep game, but it is good fun and curiously compelling. It helps that the graphics are crisp but simple, and the musical score an appropriate fast metal beat.