If I have anything remotely related to say about the current Undertale/Deltarune discourse: Ultima IV was doing the whole "ethical RPG" thing back around 1985. When people were playing *the first Super Mario Bros*, there was an RPG where you were encouraged to be nice instead of attacking everything
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Granted, I was still using Windows regularly when Undertale came out, but I was moving towards Linux more, so Undertale not being out for Linux annoyed me.