Playing this as a group of 4 and it's a really, really fun game.
Can't put my finger on what it is but in general the survival genre bores me pretty quickly but something about this has me hooked. The atmosphere works well, it scales well without seeming like a pointless grind and really rewards coop play.
We are 27 hours in killed the first boss and since then just been building up a huge hall we share, well 3 of us so, one chap likes to be a bit of a loner, we have portals up a really decent running economy supporting one another and at some point soon will have to ocean hop for the second boss and establish a base overseas.
I've fell more into the building role of the group which wouldn't normally be my style but really enjoying it building up the hall and its walls and now building a road between our settlements as portals don't let you move some materials.
The random attack events are fun, the buggers smashed down my newly constructed walls and had a huge battle with a load of grey dwarves in the courtyard.
Great game and having played 27 hours and barely scraping the surface is insane and this is blinking early access!