Just released on steam early access. If you like minecraft, spaceships, simulated physics, or just smashing things together and watching them break, then you have to get this game:
Lots of new things added since launch, with more updates every other week or so. Landing gear for docking ships. Mining drills function now, and motors can be used to create rotating sections of ships. Still no multiplayer, but people are already building crazy things, like this monster mining machine with a detachable collection system!