Im not a Fan of Tower Defense games at all. But Mindustry for me, is a regular visit. Since the first time i played the old version in the browser, i was hooked.
I may never conquer the entire planet. Let alone Erekir, simply too complicated and too different game-mechanics for me. But playing around for 30 minutes to an hour every week or so, just feels great.
Easily one of the best games that to to mind. I wish i had a Router in real life...