Or Mindustry, which is open source: https://mindustrygame.github.io/ https://mindustrygame.github.io/ Mindustry has two "planets" and they play entirely differ

Or Mindustry, which is open source: https://mindustrygame.github.io/ https://mindustrygame.github.io/ Mindustry has two "planets" and they play entirely differently. The newer one, Erekir, is a mix of Factorio, tower defense and RTS elements. I actually liked it a bit more than Factorio, because it is less complex. I didn’t really like the first planet though (Serpulo) and stopped after playing through Erekir twice.