In single player, click and hold the mouse button to make your shooting star fly outward from the sun... otherwise, it will spiral inwards. Collect stars to grow your tail until you're finally long enough to wrap around the sun to achieve Ouroboros!
In multiplayer, use keys to move your shooting star toward or away from the sun. Knock into the other player's tails to extinguish them slightly. When your tail has disappeared totally, you're out! The last player standing wins.
Ourobits.swf is the original submission for ggj2012.
Ourobits_v2.swf is an updated, even better version!
Play by clicking the SWF above. Requires Flash.
Tested on windows, mac, and android 4.0.