Games like Claire de Lune
Games like Claire de Lune include Portal 2, Portal, A Story About My Uncle, The Talos Principle 2, and GRIS. We matched them by the tags players give Claire de Lune on Steam (Adventure, Indie, 3D Platformer, Sci-fi, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: First-Person · Platformer · Story Rich

Portal
Shared: 3D Platformer · Puzzle Platformer · Sci-fi

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

The Talos Principle 2
Shared: Story Rich · Sci-fi · Puzzle Platformer

GRIS
Shared: Indie · Adventure · Beautiful

Ratchet & Clank: Rift Apart
Shared: Adventure · 3D Platformer · Action-Adventure

Chained Together
Shared: Adventure · Puzzle Platformer · 3D Platformer

Indiana Jones and the Great Circle
Shared: Adventure · Story Rich · First-Person

Ori and the Will of the Wisps
Shared: Adventure · Platformer · Story Rich

INSIDE
Shared: Puzzle Platformer · Indie · Story Rich

Viewfinder
Shared: Puzzle Platformer · Adventure · First-Person

Little Nightmares
Shared: Adventure · Puzzle Platformer · Indie

Sonic Frontiers
Shared: Adventure · 3D Platformer · Action-Adventure

Firewatch
Shared: Adventure · Story Rich · First-Person

Outer Wilds
Shared: Adventure · Story Rich · Indie

Valley
Shared: Adventure · Indie · First-Person

MO:Astray
Shared: Indie · Adventure · Puzzle Platformer

Supraland
Shared: Adventure · Puzzle Platformer · First-Person

Hello Neighbor
Shared: Story Rich · First-Person · 3D Platformer

Red Dead Redemption 2
Shared: Adventure · Story Rich · Realistic

Little Nightmares II
Shared: Adventure · Story Rich · Puzzle Platformer

Deliver Us Mars
Shared: Sci-fi · Story Rich · Puzzle Platformer

Half-Life 2
Shared: Sci-fi · Adventure · Story Rich

LIMBO
Shared: Indie · Puzzle Platformer · Adventure