Mindustry (itch)
About
A sandbox tower defense game-- Create elaborate supply chains of conveyor belts to feed ammo into your turrets, produce materials to use for building, and defend your structures from waves of enemies. Now supports LAN and WAN cross-platform multiplayer!
Mindustry Wiki - currently a work in progress.
Mindustry Discord - chatroom for discussion
This game is open-source! Find it on Github.