Gas Powered Games announces that Space Siege is now available in stores worldwide, offering action/RPG gameplay in a science-fiction environment (thanks Gamer's Hell). A playable demo for the game was released a couple of weeks ago (story). Here's word, including a miniaturized e-tailer link:

The final defense of humanity begins today! In Space Siege, a thrilling action-RPG adventure, you assume the role of Sgt. Seth Walker and wage war against humanity's would-be executioners, the alien race known as the Kerak. Wield high-powered weapons, unleash your robot companion and make the ultimate moral decision -- how much of your humanity will you sacrifice in order to save the human race?

Published by Sega, Space Siege is now available at finer retailers everywhere, including Amazon.com, in case you prefer to purchase a copy online.