The soundtrack alone is worth playing the game. The incidental multiplayer where you can't communicate directly and you don't see the name of your friend is brilliant.
It's a game that will stay with you for a long time, sort of like Firewatch in that way.
I played late at night and no one joined in the game, but I played at norml hours twice in a row and found companions. So I guess.. Probably usually there are enough people playing