The developers are working on the online multiplayer update! Local co-op is already available.

5 actions. 2 minutes. Impossible odds, and many, many ways to die. There really is nothing quite like The Living Dungeon. Up to 9 players can take part in a battle of wits, luck and skulduggery, Or delve into a 30 hour story campaign and try to guide our hero's to freedom.

Story page: http://store.steampowered.com/app/362290/