Games like Chamber One
Games like Chamber One include Portal 2, Chained Together, Portal, A Story About My Uncle, and Defy Gravity Extended. We matched them by the tags players give Chamber One on Steam (Adventure, Casual, Platformer, Puzzle Platformer, and First-Person): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Platformer · First-Person · Puzzle Platformer

Chained Together
Shared: Adventure · Platformer · Casual

Portal
Shared: Puzzle Platformer · First-Person · Sci-fi

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

Defy Gravity Extended
Shared: Platformer · Puzzle Platformer · Indie

LIMBO
Shared: Puzzle Platformer · Platformer · Indie

Refunct
Shared: Casual · First-Person · Puzzle Platformer

Supraland
Shared: Adventure · Puzzle Platformer · First-Person

FEZ
Shared: Platformer · Indie · Adventure

Viewfinder
Shared: Puzzle Platformer · First-Person · Adventure

Climber Animals: Together
Shared: Platformer · Casual · Puzzle Platformer

BEEP
Shared: Adventure · Platformer · Indie

No Man's Sky
Shared: Space · Adventure · Sci-fi

Nihilumbra
Shared: Adventure · Platformer · Casual

Quantum Conundrum
Shared: Puzzle Platformer · First-Person · Casual

MO:Astray
Shared: Adventure · Indie · Puzzle Platformer

Little Nightmares
Shared: Adventure · Puzzle Platformer · Indie

Pinstripe
Shared: Adventure · Casual · Indie

Out There Somewhere
Shared: Platformer · Adventure · Indie

Shady Part of Me
Shared: Indie · Platformer · Adventure

Slime Rancher
Shared: Adventure · First-Person · Casual

Q.U.B.E: Director's Cut
Shared: Adventure · First-Person · Indie

GRIS
Shared: Adventure · Indie · Platformer

Climb The Backrooms
Shared: Adventure · Casual · Platformer