Games like Causal Effect
Games like Causal Effect include CaseCracker, No Case Should Remain Unsolved, Murders on the Yangtze River, Her Story, and 7 Days to End with You. We matched them by the tags players give Causal Effect on Steam (Detective, Interactive Fiction, Puzzle, Text-Based, and Word Game): closest matches first, and among equally close ones the better-known games.

CaseCracker
Shared: Detective · Text-Based · Puzzle

No Case Should Remain Unsolved
Shared: Interactive Fiction · Puzzle · Story Rich

Murders on the Yangtze River
Shared: Detective · Puzzle · Story Rich

Her Story
Shared: Interactive Fiction · Detective · Puzzle

7 Days to End with You
Shared: Puzzle · Word Game · Interactive Fiction

Cyber Manhunt
Shared: Puzzle · Detective · RPG

Lost Wiki: Kozlovka
Shared: Detective · Puzzle · Interactive Fiction

The Case of the Golden Idol
Shared: Detective · Puzzle · Story Rich

Unheard - Voices of Crime
Shared: Detective · Puzzle · Story Rich

The Roottrees are Dead
Shared: Detective · Puzzle · Story Rich

Cyber Manhunt 2: New World - The Hacking Simulator
Shared: Detective · Puzzle · Story Rich

The Life and Suffering of Sir Brante
Shared: Interactive Fiction · Story Rich · Text-Based

Aliya: Timelink
Shared: Interactive Fiction · Word Game · RPG

Duck Detective: The Secret Salami
Shared: Detective · Casual · Investigation

Roadwarden
Shared: Text-Based · Interactive Fiction · RPG

The Mermaid Mask
Shared: Detective · Puzzle · Interactive Fiction

Return of the Obra Dinn
Shared: Detective · Puzzle · Story Rich

xiuzhen idle
Shared: Word Game · Casual · RPG

Eternal Threads
Shared: Puzzle · Detective · Time Manipulation

The Operator
Shared: Detective · Puzzle · Investigation

Retirement Simulator
Shared: Story Rich · RPG · Casual

Chants of Sennaar
Shared: Puzzle · Detective · Word Game

Trials of Innocence
Shared: Detective · Interactive Fiction · Story Rich

Breakout 13
Shared: Interactive Fiction · Puzzle · Story Rich