online or lan multiplayer games

make game where someone can host game and have upto 3 other players that can join, each choosing different locations on map/or an island in surrounding area of map where they can compete against each other and trade with other players and the normal game AI islands when their resources or items are short , where each player tries being the first to reach the end goal first or even beyond end goal of the game. thus allowing even more game development and dlc add ons if required.

I was thinking that the ability to cooperatively manage an island would be fun myself. Everyone existing on the same world map is an interesting option as well, but I find that the cognitive load of managing a bunch of production chains is the main problem I have when playing, and so everyone managing the same island would be fun for me.
I also imagine that from a technical level, this would be the easier form of MP to implement, since commands are already largely independent of the player once issued. Instant consumption via unity and adjustment of speed / difficulty are probably the hard parts there.