Games like The Sob Island
Games like The Sob Island include Murders on the Yangtze River, Sally Face - Episode One, Chants of Sennaar, Firework, and The Silent Age. We matched them by the tags players give The Sob Island on Steam (Puzzle, Psychological Horror, Singleplayer, Exploration, and Strategy): closest matches first, and among equally close ones the better-known games.

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

Sally Face - Episode One
Shared: Psychological Horror · Puzzle · Story Rich

Chants of Sennaar
Shared: Puzzle · Singleplayer · Exploration

Firework
Shared: Puzzle · Psychological Horror · Singleplayer

The Silent Age
Shared: Psychological Horror · Puzzle · Singleplayer

The House of Da Vinci
Shared: Puzzle · Hidden Object · Exploration

Outer Wilds
Shared: Exploration · Puzzle · Singleplayer

Fallout 4
Shared: Singleplayer · Exploration · Post-apocalyptic

OneShot
Shared: Puzzle · Singleplayer · Story Rich

Outcore: Desktop Adventure
Shared: Psychological Horror · Puzzle · Exploration

Rusty Lake Paradise
Shared: Puzzle · Psychological Horror · Singleplayer

OMORI
Shared: Psychological Horror · Story Rich · Indie

The White Door
Shared: Puzzle · Psychological Horror · Singleplayer

Carto
Shared: Puzzle · Exploration · Singleplayer

Turnip Boy Commits Tax Evasion
Shared: Puzzle · Exploration · Psychological Horror

FAR: Lone Sails
Shared: Singleplayer · Exploration · Puzzle

Blue Prince
Shared: Puzzle · Exploration · Singleplayer

Fran Bow
Shared: Psychological Horror · Puzzle · Singleplayer

Gorogoa
Shared: Puzzle · Singleplayer · Indie

Fallout: New Vegas
Shared: Singleplayer · Exploration · Post-apocalyptic

Sultan's Game
Shared: Singleplayer · Strategy · Psychological Horror

Cube Escape Collection
Shared: Puzzle · Psychological Horror · Singleplayer

The Room 4: Old Sins
Shared: Puzzle · Singleplayer · Hidden Object

Word Game
Shared: Puzzle · Exploration · Strategy