If SAVING works the same way it does in Undertale and Kris is aware of when we reset time, Chapter 3 would be a wake up call for them, I think. The entire thing is so gamified, that the player is willing to perfect his runs in order to see the games secrets to the end. In any route, thats the first time Kris can see the Soul is willing to kill even the characters closest to it to see the end