I've experienced multiplayer and started solo. The game itself doesn't really have much that is devoted for multiplayer. There's a couple things to lock doors and chests so other players can't open it, then some boats have extra seating.

It is more or less a single player game with the ability to play together, with a few features for multiplayer quality of life.

So far the players I've met were/are great and enjoy sharing their creativity. Had I been oblivious of the multiplayer option, I'd be happy with the game anyway.