Mindustry is a tower defense game that has some RTS strategies, especially when playing with other human players. You have to stock your defensive units with am

Mindustry is a tower defense game that has some RTS strategies, especially when playing with other human players. You have to stock your defensive units with ammo by drawing (and defending) conveyors with resources (different minerals and/or energy) that feed them. (Just noticed Factorio is mentioned below; Mindustry is similar, but also Open Source cross platform Java)