Executive Assault 2 is now on Steam early access and it's set in space! Build infantry, fly ships and expand your custom space station. It's the same mix of FPS/RTS that the previous game had.
The graphics look like they've been improved, ship design is pretty neat, and the Steam reviews are Very Positive. Maybe this will be able to help scratch that space game itch I'm sure we all have.
Price: $25 USD