Woah. Did this ever happen? I know we've now got Deltarune which, if I recall correctly, is a prequel. Did we ever get Undertale? If so, I might've forgotten about it. Would make sense if we ended up getting Deltarune, though.
Still have that game downloaded on my Switch but unplayed. I've never played Undertale either. I remember it used to be pretty popular... as this thread was created, which would've been around five years ago. How time flies! It all goes by in no time at all, maybe it'll only feel like tomorrow that Fortnite was a game of the past.
There could've been real potential for this based on how Five Nights at Freddy's is still going. Then again, I still see Undertale sometimes, but without constant updates or sequels, it's not going quite as strong. Wouldn't it be strange to see Undertale still going strong five years later? Guess this one got left behind, sadly.
...We've now got Sans in Smash, at least. Bet nobody saw that coming.