OkI know Toby Fox said this and I believe him. I will say that basically, what you're seeing here is not the world of UNDERTALE. UNDERTALE's world and ending are the same as however you left them. If everyone was happy in your ending, the people in the UNDERTALE world will still be happy. So,…
What is DeltaRune? (Full Theory) Don't Forget. : r/Undertale
3 Deltarune Theories of Varying Levels of Legitimacy
Reacting to YOUR Deltarune Theories! Deltarune Theory Review LIVE
Dorky art and blogging ahoy!. — Deltarune Theory: Who Spoke to Jevil and Spamton?
Deltarune theory: who closed the storage room door? (spoilers: it was Alphys [bring your tin foil hats!]) : r/Deltarune
Susie and Trust (by determinators) : r/Deltarune
Who else could join the party Deltarune - The RPG Theory (Part 5 ft. MysticSlime)
Talk about deltarune au's, fanfics, ships, or anything about the game! : r/ Deltarune
Dorky art and blogging ahoy!. — Deltarune Theory: Who Spoke to Jevil and Spamton?
A Comprehensive Deltarune Theory : r/GameTheorists