CzigBot
First time out of the vault

I've recently started preferring games with lots of depth and sometimes a high learning curve, action and most storylines just don't interest me anymore, I want the stimulation of learning a complicated system. So far I've burned myself out on:
-Factorio
-Kerbal Space Program
-From The Depths
-X3:Terran Conflict and Albion Prelude
-ARMA 3
-Spacechem
-Prison Architect
-Burned out for now on Children of a Dead Earth, but as soon as some more content is added I'll be back to optimizing my designs.
Anybody know some other good ones? I'm going to grab Cities:Skylines when it's next on sale as well.
-Factorio
-Kerbal Space Program
-From The Depths
-X3:Terran Conflict and Albion Prelude
-ARMA 3
-Spacechem
-Prison Architect
-Burned out for now on Children of a Dead Earth, but as soon as some more content is added I'll be back to optimizing my designs.
Anybody know some other good ones? I'm going to grab Cities:Skylines when it's next on sale as well.