Okay, let's try to guess all my opponents that I haven't already guessed (and aren't also me)! I submitted a preposterous number of recs again, so this may take a while…
#197: I think I'm going to second the Clue guess.
#201: Okay, but what if this time it actually IS the Broken Earth Trilogy?! (Though I'm not sure how to sell that as "whimsical romantasy", but maybe there's a way?)
#206: I agree that this is NOT Super Mario, since it clearly wants us to think that, but is worded such that it could be any number of other things. I considered guessing E.T. myself, but I don't think that can be spun as a platformer? Never played it, so I'm not sure. Instead, I'll second Castlevania III since the guesser seems to have way more knowledge of old-school gaming than I do.
#216: I can only second the Steven Universe guess, including the part where it doesn't actually work…
#223: I'm going to guess Wildermyth. Many campaigns do span generations; anyone can die without "sacrificing their narrative" because they persist as legacy characters (under the right conditions), and also death is part of their narrative; things are randomly generated to some extent so the course of events is "wildly unpredictable" at first; and if you don't lock the relationship, legacy characters can fall in love with someone different every time you recruit them, so "polyamory". Not sure about "open sexuality" (is that somehow referencing the way you can toggle which gender characters are attracted to?), but I won't worry about it because it fits pretty well overall!
#231: Identity and equality… a "lightbulb moment"… "fourteen-year-old me thought about that for AGES"… I want to say this is somehow a math thing. Like, a math textbook, a problem where you solve for X? I'm going to guess this is an algebra textbook.
#233: No idea, so after glancing at the Wikipedia page I'll second the guess for Limbus Company which I know nothing about.
#244: I feel like it's a trap but… some sort of Harry Potter spinoff? If not, I apologize for comparing whatever this is to Harry Potter XD
#252: No idea… my terrible wild guess is something Slender Man-related?
#253: Earthbound, maybe…?? Not sure why this has Earthbound vibes to me…
#256: I'll guess Cells At Work like everyone else since it seems to fit from the Wikipedia page.