As far as Undertale goes at least even if maybe the design kind of looks like it’s designed to tap into 80’s nostalgia I really don’t get the impression that’s the main appeal for most people. The fandom thing is definitely true though, I’m glad I was young and chronically offline enough not to see any of that before I’d played the game through in its entirety
Honestly I kind of like the long matches, but it definitely negatively affects how often I play. For Dota especially it feels like if I’m going to queue I have to be prepared for an hour long game, and while I don’t necessarily have a problem with that, I’m not always feeling it.
I can’t stand pretty much any kind of shooter. Is that mostly because I suck? Probably, but I still don’t like them.
To be honest I haven’t played either