>>718442924 (OP)
Some suggestions:
Rainworld: Maybe slightly above average IQ because of ecosystem/lore autism. There's also cool semiotics stuff.
Definitely attracts mentally ill people more than normies.
Stardew Valley: Very close to the center of the chart.
Pathologic: Similar to Rainworld in terms of appeal, and also a survival game of sorts with more resource management. Writing is schizo meta and requires understanding local culture and hobo economics.
Anything TES would fit perfectly under low IQ/sane but a little bit higher than console shooters.
Borderlands is like a perfect example of a low IQ sane game too.
Consider splitting Zachtronics into multiple games. Opus Magnum and Infinifactory are significantly more approachable than TIS-100 and Spacechem.