I happened to stumble upon this game some time ago, while i am not sure what exactly is going on with the game. I've read it's already been released and quite playable, and others say that only sometime in 2013 will the game be completed. It shares many elements with Minecraft. Block Building, Survival, Monsters come after you, INFINITE world generation. But the game goes to the extremes. Enough of earth? Take one of the vehicles and fly really high, out of orbit and build a space station.
A google video search for Starforge 2013 will give you the video, i can't link it apparently.
You can download the very early alpha but it's quite bad. Lag from not being optimized, Monsters crawl as fast as a sports car, in game menu's and block interface seems to be from another planet. It's just plain hard to know what the whole menu does anyway. Long story short, in the early alpha a lot of things are wrong, but the early alpha is from 2010 i think.. imagine what the game must be like now. I don't know about you guys but i am going to keep a eye on this.