Games like 《道格拉斯警督的日记》
Games like 《道格拉斯警督的日记》 include No Case Should Remain Unsolved, Her Story, 7 Days to End with You, Suzerain, and The Wolf Among Us. We matched them by the tags players give 《道格拉斯警督的日记》 on Steam (Detective, Interactive Fiction, CRPG, Visual Novel, and Stylized): closest matches first, and among equally close ones the better-known games.

No Case Should Remain Unsolved
Shared: Interactive Fiction · Visual Novel · Puzzle

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

7 Days to End with You
Shared: Visual Novel · Choose Your Own Adventure · Puzzle

Suzerain
Shared: Visual Novel · Interactive Fiction · Choose Your Own Adventure

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

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Interactive Fiction · Multiple Endings

The Test
Shared: Choose Your Own Adventure · Multiple Endings · Visual Novel

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

Lay a Beauty to Rest: The Darkness Peach Blossom Spring
Shared: Visual Novel · Interactive Fiction · Multiple Endings

Aliya: Timelink
Shared: Interactive Fiction · Visual Novel · Word Game

Pentiment
Shared: Interactive Fiction · Stylized · Investigation

The Test: Hypothesis Rising
Shared: Visual Novel · Choose Your Own Adventure · Multiple Endings

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

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Choose Your Own Adventure · Interactive Fiction

The NOexistenceN of you AND me
Shared: Visual Novel · Interactive Fiction · Multiple Endings

Disco Elysium - The Final Cut
Shared: Detective · CRPG · RPG

Far Away
Shared: Visual Novel · Word Game · Choose Your Own Adventure

The Weeping Swan: Ten Days of the City's Fall
Shared: Interactive Fiction · Visual Novel · Multiple Endings

The Mermaid Mask
Shared: Detective · Interactive Fiction · Visual Novel

The Test: Final Revelation
Shared: Choose Your Own Adventure · Visual Novel · Detective

Murders on the Yangtze River
Shared: Detective · Puzzle · Adventure

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

Trials of Innocence
Shared: Detective · Interactive Fiction · Visual Novel

Chants of Sennaar
Shared: Detective · Puzzle · Word Game