Mindustry by Anuke

About

Mindustry is a hybrid tower-defense sandbox factory 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. Features include a map editor, 24 built-in maps, cross-platform multiplayer and large-scale PvP unit battles. Consider buying this game on  Steam for features like achievements, seamless multiplayer and map browsing/Workshop support.