Games like Lightmatter
Games like Lightmatter include COCOON, The Talos Principle, LIMBO, Little Nightmares, and Portal. We matched them by the tags players give Lightmatter on Steam (Logic, Indie, Adventure, Puzzle, and First-Person): closest matches first, and among equally close ones the better-known games.

COCOON
Shared: Adventure · Indie · Puzzle

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

LIMBO
Shared: Indie · Puzzle · Adventure

Little Nightmares
Shared: Adventure · Indie · Atmospheric

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

The Talos Principle 2
Shared: Puzzle · First-Person · Sci-fi

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

Machinika Museum
Shared: Puzzle · Indie · Sci-fi

Poppy Playtime
Shared: Puzzle · First-Person · Indie

Inside the Backrooms
Shared: Puzzle · Adventure · First-Person

Outer Wilds
Shared: Adventure · Puzzle · Indie

The Room
Shared: Puzzle · Adventure · Indie

Antichamber
Shared: Indie · Puzzle · First-Person

ROUTINE
Shared: Sci-fi · Adventure · Atmospheric

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

Seen
Shared: Indie · Adventure · Puzzle

The Room Three
Shared: Puzzle · Adventure · Indie

The Turing Test
Shared: Puzzle · First-Person · Sci-fi

Riven
Shared: Adventure · Puzzle · First-Person

Q.U.B.E: Director's Cut
Shared: Indie · Puzzle · Adventure

The Last Campfire
Shared: Adventure · Puzzle · Indie

Cradle
Shared: Indie · Adventure · Sci-fi

Little Nightmares II
Shared: Adventure · Puzzle · Atmospheric

The Pedestrian
Shared: Logic · Puzzle · Atmospheric