Planetary Annihilation is the latest title to land on Steam's Early Access program (you can download it here should you wish, though it does cost a staggering £67.99). The RTS game was a successful Kickstarter project, and was funded to the tune of $2.2million USD last year. Early Access on Steam marks the start of a three month long alpha, with a beta period set to kick off in September. The game is set to launch in December.