Hexagon, a browser-based twitch game by Terry Cavanagh of VVVVVV fame.
You control a small triangle that orbits the hexagon in the middle of the screen. Various shapes and line segments fall toward the hexagon, and it's your job to avoid them in a frantic-yet-calculated, reverse Tempest-style gauntlet of adrenaline and frustration. You must last predetermined amounts of time in order to advance to the next level, at which point the game speeds up and the incoming shapes increase in complexity. The whole experience is set to a phenomenal chiptune track courtesy of Chipzel; it feels like we should be playing it in that rollerblade techno club from Hackers.
The game was created yesterday morning for Pirate Kart V, a two-day event in which hundreds of programmers around the world attempt and create as many games as humanly possible in the short span of 48 hours. It's a wonderful example of game design in its purest form, and we challenge all of you to beat our best time of 35:23 at Level 4.