Is multiplayer available? Can we build on one shared map?

The public version supports weak multiplayer, confirmed by the author. In Empire play, players develop their own territories and interact through systems such as resource exchange; it is not simultaneous resident control on one shared construction map. Connection options include Steam rooms and IP/LAN, with Steam readiness still checked by the menu. Choose create or join and use the matching room information. Early no-multiplayer replies are obsolete.