Thanks, it's not a Unity game however. I made it in javascript using Playroom library for creating multiplayer games. It wasn't hard as the library is pretty good. Every player sends their current "joystick" state and the server calculates and sends positions. All the other calculations are done on the client side and once per game day I sync positions of the plants, because they are the ones that can get desynced.
I've heard Playroom are working on Unity version of their library, but I don't know how soon that will be done.