Games like Shanwen
Games like Shanwen include Firework, Murders on the Yangtze River, Unheard - Voices of Crime, Sanfu, and The Case of the Golden Idol. We matched them by the tags players give Shanwen on Steam (Mystery, Puzzle, Exploration, Multiple Endings, and Detective): closest matches first, and among equally close ones the better-known games.

Firework
Shared: Puzzle · Mystery · 2D

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

Unheard - Voices of Crime
Shared: Mystery · Detective · Thriller

Sanfu
Shared: Mystery · Puzzle · 2D

The Case of the Golden Idol
Shared: Mystery · Puzzle · Detective

Strange Horticulture
Shared: Mystery · Puzzle · Detective

Tangle Tower
Shared: Puzzle · Detective · Exploration

Outer Wilds
Shared: Mystery · Exploration · Puzzle

Danganronpa: Trigger Happy Havoc
Shared: Mystery · Detective · Visual Novel

Return of the Obra Dinn
Shared: Mystery · Puzzle · Detective

Phoenix Wright: Ace Attorney Trilogy
Shared: Mystery · Detective · Puzzle

The Roottrees are Dead
Shared: Puzzle · Mystery · Detective

The Painscreek Killings
Shared: Mystery · Exploration · Puzzle

Desktop Explorer
Shared: Puzzle · Mystery · Detective

Paper Bride
Shared: Puzzle · Mystery · Detective

Danganronpa 2: Goodbye Despair
Shared: Mystery · Detective · Visual Novel

Who's Lila?
Shared: Detective · Exploration · Puzzle

Cube Escape Collection
Shared: Puzzle · Mystery · Detective

The Rewinder
Shared: Mystery · Puzzle · Detective

Breakout 13
Shared: Exploration · Interactive Fiction · Puzzle

Sally Face - Episode One
Shared: Puzzle · Mystery · Indie

Sherlock Holmes: The Devil's Daughter
Shared: Mystery · Puzzle · Detective

Trials of Innocence
Shared: Detective · Mystery · Interactive Fiction

Strange Antiquities
Shared: Mystery · Puzzle · Detective