Speculative realism: 'Hard' science fiction falls into this category, but also worldbuilding that tries to think through the implications of magic (5e strikes me as not having thought through these implications, given that cantrips, 1st level spells, and common magic items could solve many real world problems while undoubtedly creating others). Science fiction games strike me as potentially problematic because there are going to be a variety of expectations regarding how 'real' the universe has to be (i.e. do you want to play science fiction or science fantasy?)