Games like Morth
Games like Morth include Who's Lila?, Her Story, No Case Should Remain Unsolved, Breakout 13, and Ib. We matched them by the tags players give Morth on Steam (Horror, Choose Your Own Adventure, Investigation, Exploration, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Who's Lila?
Shared: Horror · Choose Your Own Adventure · Interactive Fiction

Her Story
Shared: Investigation · Choose Your Own Adventure · Interactive Fiction

No Case Should Remain Unsolved
Shared: Investigation · Interactive Fiction · Point & Click

Breakout 13
Shared: Choose Your Own Adventure · Interactive Fiction · Exploration

Ib
Shared: Horror · Exploration · Choose Your Own Adventure

Suzerain
Shared: Choose Your Own Adventure · Interactive Fiction · RPG

Pentiment
Shared: Investigation · Interactive Fiction · Exploration

Roadwarden
Shared: RPG · Choose Your Own Adventure · Interactive Fiction

The Life and Suffering of Sir Brante
Shared: Choose Your Own Adventure · Interactive Fiction · RPG

Slay the Princess — The Pristine Cut
Shared: Horror · Choose Your Own Adventure · Choices Matter

Five Nights at Freddy's: Into the Pit
Shared: Horror · Exploration · 2D

Until Dawn™
Shared: Horror · Choose Your Own Adventure · Interactive Fiction

The Test
Shared: Choose Your Own Adventure · Horror · Investigation

60 Seconds! Reatomized
Shared: Choose Your Own Adventure · Exploration · 2D

Murders on the Yangtze River
Shared: Exploration · Investigation · Detective

OMORI
Shared: Horror · RPG · Indie

THE LONGING
Shared: Choose Your Own Adventure · Point & Click · Exploration

The Case of the Golden Idol
Shared: Investigation · Point & Click · Detective

The Wolf Among Us
Shared: Choose Your Own Adventure · Detective · Adventure

The Test: Hypothesis Rising
Shared: Horror · Choose Your Own Adventure · Investigation

Word Game
Shared: Choose Your Own Adventure · Exploration · RPG

Disco Elysium - The Final Cut
Shared: RPG · Point & Click · Detective

Pocket Mirror ~ GoldenerTraum
Shared: Horror · RPG · 2D

Killer Frequency
Shared: Horror · Interactive Fiction · Exploration