@chloyster
Not a new game, but I've been replaying Undertale as part of a large randomized multiworld. Every item or big event I unlock turns into a random item or unlock for somebody else's game. And random items in their games are sent to me as random items in mine (or another game). It's called Archipelago, it's really fun and there are games you wouldn't expect to be supported (like The Witness). It's called Archipelago.