If you're looking for something to play in the short term, with a lot of long term potential, check this game out:
http://empyriongame.com/
It features ship and ground vehicle building, similar to Space Engineers, but has a survival element. It's kind of a poor man's, "No man's Sky." It's currently in Early Access. They're planning on having a procedural universe, akin to Elite Dangerous, but the current gameworld consists of 3 or 4 planets. I've been playing for a few days, and it's a pretty rewarding experience. $18 on Steam:
http://store.steampowered.com/app/383120/