Oxygen Not Included
Oxygen not included is my favourite game right now. It's made by the same creator of Don't Starve. Oxygen Not Included is a space-colony simulation game. Manage your colonists and help them dig, build and maintain a subterranean asteroid base. You'll need water, warmth, food, and oxygen to keep them alive, and even more than that to keep them happy.
This game is currently in development.