http://empyriongame.com/story/
This PC game continuously keeps up with their mission to update and by updates I mean weekly new patches, bug fixes. If any of you are playing it lets get together and play, if you aren't, I suggest you begin! I played another alpha game called Rust and this by far blows it out of the water. You are on a planet and have to survive and you are able to build a base, small vessel and capital vessel. You can travel to other planets as creatures and resources change. It's very interesting and only about $20 to play. Again its alpha so things change all the time. I am feeling really confident about this one.