Mindustry is described as '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'. There are eight games similar to Mindustry for a variety of platforms, including Windows, Linux, the Web, Android and Mac. The best alternative is Factorio. It's not free, so if you're looking for a free alternative, you could try shapez.io or Factory idle. Other Mindustry like games are Dyson Sphere Program (Paid), Satisfactory (Paid), Automation Empire (Paid) and Bleentoro (Freemium).