shapez.io is described as 'open source base building game inspired by factorio! Available on web & desktop' and is a Factory Building Game in the Games category. There are three games similar to shapez.io for a variety of platforms, including Windows, Linux, Mac, Steam and Android. The best alternative is Mindustry, which is both free and Open Source. Other shapez.io like games are Factorio (Paid) and Dyson Sphere Program (Paid).
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. Play with your friends in cross-platform multiplayer co-op games, or challenge them in team-based PvP matches.