As it turns out, there is a secret alternative route in Deltarune: Chapter 2 known as the "Snowgrave" route! This is very similar to Undertale's Genocide route and changes the progression of the game quite a bit.
Getting this route to trigger is very complex. If you would like to try out this route for yourself, there is a very useful document to follow along with: https://docs.google.com/document/d/1AL95g4hxFb5WWHX1kkt6LI-Wbkwt1x3V8lodhPFBkMU/preview?pru=AAABfCCjeaw*qpH5tzAPYe0UZLO7nKlmJA
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