Came here with the intention of mentioning Factorio as well. What really makes it next level, though, is the modding community and support for it. IMO the vanilla endgame is pretty quick, you can actually burn through the game with very limited resources and using very little space -- and then you have modpacks like SeaBlock, which make complex machinery an absolute must, and make even basic stuff like power generation a proper challenge, to the point that a single playthrough will ultimately be at least a hundred hours.

What Wube have created with that game is nothing short of marvellous.