Here's a Steam Community announcement with word that Xenonauts is now available on Steam after over five years of development and an Early Access period for Goldhawk Interactive's X-COM-inspired strategy game (thanks DocZ). Word is they are turning their attention to adding Steam Workshop support as well as completing the OS X and Linux ports, which should be ready soon. Here's the rundown on the game:

Xenonauts is a strategy game in which you control a multi-national military organisation defending a Cold War-era Earth from alien invasion, using small squads of persistent soldiers to eliminate the extraterrestrials and recover their technology in turn-based ground combat. A detailed strategic layer allows you to co-ordinate the defence of the planet, using your interceptors to shoot down UFOs and researching captured artefacts to learn about your foes and unlock new combat equipment to use on your missions.

Xenonauts is a spiritual successor to the classic X-Com strategy games from the 1990s. We aim to improve the graphics, add new content and streamline the interface whilst still retaining all of the key mechanics of the original games. Devoted fans should love this game, but we're also keen to introduce the joys of old-school grand strategy to a whole new generation of players who might not otherwise experience it!