https://mindustrygame.github.io/ (Open source)
https://anuke.itch.io/mindustry (Pay-what-you-want, recommends $6.00)
https://store.steampowered.com/app/1127400/Mindustry/ ($5.99, with various Steam integrations; it has over 4,900 _reviews_ by people who _purchased it on Steam_, which indicates a lot more purchases. See also this: https://mindustrygame.github.io/wiki/faq/#why-are-you-chargi...)