Games like The Sword That Kills Christmas
Games like The Sword That Kills Christmas include Undertale, The Henry Stickmin Collection, DELTARUNE, Fever Meme, and Vampire Survivors. We matched them by the tags players give The Sword That Kills Christmas on Steam (Bullet Hell, Choices Matter, Text-Based, Memes, and Funny): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Choices Matter · Funny · Multiple Endings

The Henry Stickmin Collection
Shared: Funny · Memes · Choices Matter

DELTARUNE
Shared: Bullet Hell · Funny · Pixel Graphics

Fever Meme
Shared: Memes · Choices Matter · Comedy

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Indie

Roadwarden
Shared: Text-Based · Choices Matter · Interactive Fiction

Legend of Mortal
Shared: Choices Matter · Multiple Endings · RPG

Emily is Away Too
Shared: Choices Matter · Text-Based · Pixel Graphics

South Park™: The Fractured But Whole™
Shared: Comedy · Funny · Memes

Suzerain
Shared: Choices Matter · Text-Based · Interactive Fiction

OneShot
Shared: Choices Matter · Pixel Graphics · Indie

Halls of Torment
Shared: Bullet Hell · Pixel Graphics · Action RPG

Finding Paradise
Shared: Pixel Graphics · Funny · Interactive Fiction

The Life and Suffering of Sir Brante
Shared: Choices Matter · Text-Based · Interactive Fiction

The Stanley Parable
Shared: Comedy · Funny · Choices Matter

I Wani Hug that Gator!
Shared: Choices Matter · Interactive Fiction · Multiple Endings

Otaku's Adventure
Shared: Funny · Multiple Endings · RPG

West of Loathing
Shared: Funny · Comedy · Choices Matter

There Is No Game: Wrong Dimension
Shared: Funny · Comedy · Pixel Graphics

Aliya: Timelink
Shared: Interactive Fiction · Text-Based · Multiple Endings

WHAT THE GOLF?
Shared: Memes · Comedy · Funny

私のリアルは充実しすぎている フルボイス版
Shared: Text-Based · Funny · Comedy

Monster Prom 4: Monster Con
Shared: Choices Matter · Comedy · Funny

Endless Monday: Dreams and Deadlines
Shared: Choices Matter · Interactive Fiction · Multiple Endings