Would Under rail Online be a great addition?
Tons of fun playing with or against friends in a strategy type situation.
could do an arena for fighting teams to a certain level and posting stats or for fighting against friends in team to team combat.
could make players on teams with certain skills and inventories to battle each other in the arena.
or play in a two player (or more) co-op story mode, make the game more than 2x (3x, 4x 5x, ect.) as difficult to force quality team work and tactics.
i think its a great idea as long as it is not another mmo with players just killing each other, just local servers for arenas and co-op games that can be public or private.