Congrats on reaching release! A lot of promising fan-VNs get stalled early in development, but you've did it! I forget when I first saw this but I'm definitely excited to see what kind of shenanigans you put the poor characters through given what happened in the demo.
Doubly so given that the player drops into a post-Neutral route rather than being in an alternate take on mid-UT (InLove), post-Paci (Kissy Cutie), pure excuse-plot (Dancing with a Beautiful Robot, Nuts in Bolts) or hilariously insane (Tem Dayting). The consequences of being a Human in an Underground where Undyne might have been the reason why Toriel went back to the Ruins will be hilarious given that people are here to flirt with Sans. Whether Papyrus still lives will undoubtedly affect how Sans reacts to a new human. Especially one with a knife (thanks Flowey).