Games like Unlighted
Games like Unlighted include Portal 2, Portal, A Story About My Uncle, LIMBO, and Viewfinder. We matched them by the tags players give Unlighted on Steam (Strategy, Puzzle, First-Person, Platformer, and Adventure): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · First-Person

Portal
Shared: Puzzle · First-Person · Puzzle Platformer

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

LIMBO
Shared: Puzzle · Puzzle Platformer · Platformer

Viewfinder
Shared: Puzzle · First-Person · Puzzle Platformer

Poppy Playtime
Shared: Puzzle · First-Person · Singleplayer

Blue Prince
Shared: Puzzle · First-Person · Mystery

Little Nightmares
Shared: Adventure · Puzzle · Puzzle Platformer

The Talos Principle
Shared: Puzzle · First-Person · Sci-fi

Polarity
Shared: Puzzle · First-Person · Strategy

The Talos Principle 2
Shared: Puzzle · First-Person · Puzzle Platformer

Little Nightmares II
Shared: Puzzle · Adventure · Singleplayer

Outer Wilds
Shared: Adventure · Puzzle · Mystery

Bendy and the Ink Machine
Shared: First-Person · Puzzle · Singleplayer

Supraland
Shared: Puzzle Platformer · First-Person · Adventure

Superliminal
Shared: Puzzle · First-Person · Thriller

Seen
Shared: Puzzle · Adventure · Platformer

The Room
Shared: Puzzle · Adventure · Mystery

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

FEZ
Shared: Puzzle · Platformer · Adventure

The Ball
Shared: First-Person · Puzzle · Strategy

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

The Room 4: Old Sins
Shared: Puzzle · Adventure · Mystery

INSIDE
Shared: Puzzle Platformer · Adventure · Puzzle