Try Stationeers, if you like difficulty. Smelting single metals is easy, but having to smelt ores at a specific temp and pressure to create alloys is hard, especially if you have to first manufacture the gas that heats it.

Yeah I tried playing it this weekend. The very beginning was amazing and nostalgic, but as soon as I finished the opening mission I was bombarded with all the deals and packs and unlocks… I went from excited to feeling sick to my stomach over the amount of bait I had to dismiss before I even saw the main mobile landing page for the first time. I haven’t opened it since.