We've been tracking the progress of Xenonauts for a while now, and we're pleased to report that the game has just arrived on the Early Access section of Steam (it's £14.99 and available here).
The game is aiming to be the "spiritual successor to the classic X-Com strategy games from the 1990s", except with improved graphics, new content, and a streamlined UI. Expect turn-based strategy, perma-death and plenty of crashed alien space ships.