This weekend, we went back to Undertale and showed it what we intended to do the first time - namely, restart fresh and survive the game without any huge lingering feelings of guilt and heartbreak. It must be said that it didn't go quite as we had intended.
Click to view
http://youtu.be/068lSV3YkeY Apparently, in addition to all the Psycho Mantis trickery that we went through above, if you're on really bad paths then you'll get additional bloodthirsty dialogue in red text and Flowey will occasionally peek out at you from the corners of the screen. All this adds up to make it clear that Undertale is an immensely clever game. I am never playing it again.