Games like One More Experiment
Games like One More Experiment include Portal 2, Portal, The Talos Principle 2, Viewfinder, and LIMBO. We matched them by the tags players give One More Experiment on Steam (3D Platformer, Puzzle Platformer, Puzzle, Mystery, and Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · Puzzle Platformer

Portal
Shared: Puzzle Platformer · Puzzle · 3D Platformer

The Talos Principle 2
Shared: Puzzle · Puzzle Platformer · 3D Platformer

Viewfinder
Shared: Puzzle Platformer · Puzzle · First-Person

LIMBO
Shared: Puzzle Platformer · Puzzle · Platformer

The Pedestrian
Shared: Puzzle Platformer · Puzzle · Platformer

Contrast
Shared: Female Protagonist · Puzzle · Platformer

Shady Part of Me
Shared: Puzzle · Female Protagonist · Platformer

Quantum Conundrum
Shared: Puzzle Platformer · 3D Platformer · Puzzle

Blue Prince
Shared: Puzzle · Mystery · First-Person

The Ball
Shared: 3D Platformer · Puzzle Platformer · Puzzle

ANIMAL WELL
Shared: Puzzle · Puzzle Platformer · Platformer

Papo & Yo
Shared: 3D Platformer · Puzzle Platformer · Puzzle

What Remains of Edith Finch
Shared: Mystery · Story Rich · First-Person

GRIS
Shared: Female Protagonist · Platformer · Puzzle

A Story About My Uncle
Shared: 3D Platformer · First-Person · Platformer

Call of the Sea
Shared: Puzzle · Female Protagonist · Mystery

Planet of Lana
Shared: Puzzle Platformer · Puzzle · Female Protagonist

Outer Wilds
Shared: Mystery · Puzzle · Story Rich

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

Pseudoregalia
Shared: 3D Platformer · Female Protagonist · Platformer

The Gardens Between
Shared: Puzzle Platformer · Puzzle · Female Protagonist

Trine 3: The Artifacts of Power
Shared: Puzzle Platformer · 3D Platformer · Puzzle

Little Nightmares
Shared: Puzzle Platformer · Puzzle · Platformer