So the beta for this game has just started.
I'd never heard of it before but I'm now interested because of its sheer ambition. I don't think I can sum up the game better than its Wikipedia article, but to me it looks like it's essentially a 2D version of Minecraft — except it's a whole universe that's procedurally generated, the gameplay is much more in-depth, it has dungeons and missions, it fuses fantasy and sci-fi, and it has social multiplayer.
It's apparently similar in some ways to Terraria, if that means anything to anyone. Probably better to just watch this: