Games like Fluff labs
Games like Fluff labs include Portal 2, Portal, The Talos Principle 2, The Unfinished Swan, and Viewfinder. We matched them by the tags players give Fluff labs on Steam (Casual, Walking Simulator, Puzzle, 3D Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

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

Portal
Shared: Puzzle · Puzzle Platformer · 3D Platformer

The Talos Principle 2
Shared: Puzzle · Walking Simulator · Puzzle Platformer

The Unfinished Swan
Shared: Puzzle · Puzzle Platformer · Casual

Viewfinder
Shared: Puzzle · Puzzle Platformer · First-Person

The Exit 8
Shared: Walking Simulator · Puzzle · First-Person

Mini Motorways
Shared: Casual · Puzzle · Minimalist

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

Zup!
Shared: Casual · Puzzle · Puzzle Platformer

Moncage
Shared: Casual · Puzzle · Indie

Zup! F
Shared: Casual · Puzzle · Puzzle Platformer

Zup! X
Shared: Casual · Puzzle · Puzzle Platformer

Refunct
Shared: 3D Platformer · Casual · Puzzle Platformer

Zup! S
Shared: Casual · Puzzle · Minimalist

Zup! 2
Shared: Casual · Puzzle · Puzzle Platformer

The Gardens Between
Shared: Puzzle · Walking Simulator · Puzzle Platformer

Climb The Backrooms
Shared: Casual · Puzzle · 3D Platformer

PC Building Simulator
Shared: Education · First-Person · 3D

Zup! Z
Shared: Casual · Puzzle · Puzzle Platformer

Attempt[42]
Shared: Casual · 3D Platformer · Puzzle

Zup! 3
Shared: Casual · Puzzle · Puzzle Platformer

Riven
Shared: Puzzle · First-Person · Walking Simulator

The Death | Thần Trùng
Shared: Puzzle · Casual · Walking Simulator

Liars Bar
Shared: Casual · 3D · First-Person