Basically Deltarune chapter 0.... Your choices don't matter!!!! It's fun to see the stepping stones for story telling elements and jokes for Undertale and Deltarune. Some neat moments, I appreciated the creepy enemies, especially the "Remember Me" enemy, the slowed down Onett theme was a guilty pleasure as someone who likes the genocide tracks from Undertale.
It's surprisingly grind heavy for a short game. Unless you're incredibly curious on the experience I wouldn't recommend, just listen to Megolovania