Steam: All Reviews: Overwhelmingly Positive
IGN Rating: 9/10
Escape a chaotic alien planet by fighting through hordes of frenzied monsters – with your friends, or on your own. Combine loot in surprising ways and master each character until you become the havoc you feared upon your first crash landing.
Looks a bit hectic to me, but might give it a shot.
I really didn't like the change to 3D in this one. I'm really glad they then went on to make "Risk of Rain Returns", which is 2D again and much more of a true expansion/sequel to Risk of Rain.