Ahh!! I thought an Xbox console version would never happen after Undertale was only on Game Pass for PC's launch w/ no achievements or other XBL features!!
I bought the game on PC at launch and bounced off of it multiple times (I didn't think it was funny and I found the maps were too narrow compared to Earthbound, and I wasn't in the mood for that back in 2015) right before Undyne (and eventually Alphys, the funniest character) where I woulda fallen in love, but after Deltarune Ch 1 released on Switch, I decided to check the series out on that platform and it was a wrap from there. I previously stopped right where the game would have its ensemble expanded and the comedy comes from the full ensemble bouncing off each other, and it's also after that point where the game felt less onrails to me and I started to feel the slight divergences due to my actions or inactions. And all the things that fell flat (its tone of comedy, wasn't the biggest Sans fan) for me at the beginning of the game are now painfully charming upon revisits.
Loved the Switch-exclusive section, can't wait to see what this Xbox-exclusive content is like!