Farm Together if you've got friends. It's just planting crops and harvesting them. No townspeople, no combat. You get quests, to plant such a crop and harvest so many units, but they reward you with points to buy cosmetic farm items or fuel stations for your tractor.
sort of like an idle game?
Prototype 1 and 2 and Hulk Ultimate Destruction.
Windward is pretty fun and mindless. Grim Dawn is mindless as well with little spurts of thought when you apply talent points and swap out equipment. State of Decay is mind-numbing if you like zombies Hero Siege is a good twin stick bloober game in the style of binding Issac.
Agreeing on grim dawn Also, titan quest is another good one and it's almost identical to grim dawn.