Deltarune Is A Beautiful Extension Of A Deeper Undertale Universe - GameSpot

Undertale left a powerful, lasting impression, but the surprise of Deltarune (Chapter 1) proves that the lore and formula could evolve into something more.
Erick and Michael check out the latest game to come from Toby Fox, which could be a successor to Undertale. There will be spoilers, please be advised.
Undertale is an RPG where you don't have to kill anyone. Each enemy can be defeated non-violently. Dance with a slime. Pet a dog. Whisper your favorite secret to a knight. Or, ignore this choice and rain destruction upon your foes.

The Unsettling Pacifist World of Deltarune — Rhiannon Thomas

Video Games / Common Knowledge - TV Tropes

Gelugon_baat's Review of Deltarune: Chapter 1 - GameSpot

mattcrossestheline gaming from a film student's perspective

Exploring The NEW Undertale / Deltarune Halloween Status Update

Deltarune Theories and Connections to Undertale

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Why Kris most likely isn't the Knight, but with fresh evidence (relatively short post) : r/Deltarune

Deltarune Chapters 1 and 2, explained - The Washington Post

How Dark Worlds are made + What this tells us about Chapter 3 & Why [MIKE] is most likely the TV! : r/Deltarune

Deltarune The Seven Souls (Demo) at DELTARUNE Nexus - Mods and Community