This is quite possibly only going to be around for April 1st, so apologies if you read this late and the game is no longer there. But for today at least Stack Overflow have created their own pixel-art platformer in Phaser: Unikong, and it's great fun :)
Accessed from the right-hand menu the game see's you trying your best to defeat the trolls and increase your rep. It plays very much like the original Donkey Kong, but with lazer guns, unicorns and subtle little stack overflow logos here and there.
Update: Someone has mirrored the game source on GitHub.