Games like The Visitor Effect: Not an experiment
Games like The Visitor Effect: Not an experiment include Murders on the Yangtze River, Blue Prince, OneShot, Outer Wilds, and Sanfu. We matched them by the tags players give The Visitor Effect: Not an experiment on Steam (Retro, Puzzle, Story Rich, Adventure, and Logic): closest matches first, and among equally close ones the better-known games.

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

Blue Prince
Shared: Puzzle · Story Rich · Investigation

OneShot
Shared: Story Rich · Puzzle · Adventure

Outer Wilds
Shared: Story Rich · Adventure · Puzzle

Sanfu
Shared: Puzzle · Adventure · Retro

Papers, Please
Shared: Puzzle · Retro · Story Rich

Strange Horticulture
Shared: Puzzle · Adventure · Investigation

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

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

Void Stranger
Shared: Puzzle · Adventure · Story Rich

The Death Game Report
Shared: Puzzle · Adventure · Story Rich

No Case Should Remain Unsolved
Shared: Puzzle · Investigation · Story Rich

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

Twelve Minutes
Shared: Puzzle · Adventure · Story Rich

The Forgotten City
Shared: Adventure · Story Rich · Investigation

The Room 4: Old Sins
Shared: Puzzle · Adventure · Story Rich

The Talos Principle 2
Shared: Puzzle · Story Rich · Lore-Rich

Sally Face - Episode One
Shared: Story Rich · Puzzle · Adventure

Riven
Shared: Puzzle · Adventure · Story Rich

Thimbleweed Park™
Shared: Adventure · Puzzle · Retro

Word Game
Shared: Puzzle · Story Rich · Exploration

Servant of the Lake
Shared: Puzzle · Adventure · Story Rich

The Painscreek Killings
Shared: Puzzle · Investigation · Story Rich

Pentiment
Shared: Story Rich · Adventure · Investigation