Steam News announces Twin Sector is now available through Valve's digital distribution service, and the game should be available elsewhere, as the action/adventure game carried a December 5 release date when it was declared gold, though GameStop lists it as a preorder to ship next week. A playable demo is available, and here's a bit on the game: "The story of Twin Sector takes place in a post-apocalyptic future where the remains of mankind have been put to artificial sleep in cryogenic chambers deep under the contaminated surface of earth until the planet becomes habitable again."