Multiplayer is outside the scope of this game unfortunately. I love multiplayer games and would love to build one someday, but they are very challenging to develop.
No multiplayer is unfortunate, since the way the game is made so far with movement and interactions feels like a coop game. if you ever double back on that suggestion, maybe you can see if Naelstrof could help you out with it when he has time, i found this game because of his discord server after all.