Games like UnderOneRoof
Games like UnderOneRoof include DELTARUNE, Undertale, CrossCode, Impostor Factory, and To the Moon. We matched them by the tags players give UnderOneRoof on Steam (RPG, Singleplayer, Mystery, Pixel Graphics, and Dialogue Heavy): closest matches first, and among equally close ones the better-known games.

DELTARUNE
Shared: RPG · Pixel Graphics · Singleplayer

Undertale
Shared: RPG · Pixel Graphics · Singleplayer

CrossCode
Shared: RPG · Pixel Graphics · Singleplayer

Impostor Factory
Shared: Pixel Graphics · RPG · Singleplayer

To the Moon
Shared: Pixel Graphics · Singleplayer · Story Rich

Tales of the Black Forest
Shared: RPG · Pixel Graphics · Singleplayer

Papers, Please
Shared: Singleplayer · Pixel Graphics · Point & Click

Finding Paradise
Shared: Pixel Graphics · RPG · Singleplayer

The Hex
Shared: Singleplayer · Mystery · Pixel Graphics

Eastward
Shared: Pixel Graphics · Singleplayer · RPG

Ten Trials of Babel: The Doppelganger Maze
Shared: RPG · Pixel Graphics · Female Protagonist

The Rewinder
Shared: Mystery · Pixel Graphics · Singleplayer

Graveyard Keeper
Shared: RPG · Pixel Graphics · Singleplayer

Unavowed
Shared: Pixel Graphics · Point & Click · Mystery

OneShot
Shared: Pixel Graphics · Singleplayer · Story Rich

Celeste
Shared: Pixel Graphics · Singleplayer · Female Protagonist

OMORI
Shared: RPG · Pixel Graphics · Story Rich

The Witch's House MV
Shared: Pixel Graphics · RPG · 2D

There Is No Game: Wrong Dimension
Shared: Pixel Graphics · Point & Click · Singleplayer

Vampire Survivors
Shared: Pixel Graphics · Singleplayer · 2D

OFF
Shared: RPG · Pixel Graphics · Singleplayer

Stardew Valley
Shared: Pixel Graphics · RPG · Singleplayer

Kathy Rain
Shared: Pixel Graphics · Mystery · Point & Click

Heroine's Quest: The Herald of Ragnarok
Shared: RPG · Point & Click · Singleplayer