Games like Mars Mirage
Games like Mars Mirage include Portal, Portal 2, Poppy Playtime, Garten of Banban, and Buckshot Roulette. We matched them by the tags players give Mars Mirage on Steam (Puzzle Platformer, Puzzle, Space, Detective, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Portal
Shared: Puzzle Platformer · Puzzle · First-Person

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

Poppy Playtime
Shared: Puzzle · Horror · First-Person

Garten of Banban
Shared: Puzzle · First-Person · Horror

Buckshot Roulette
Shared: First-Person · Horror · 3D

Return of the Obra Dinn
Shared: Puzzle · Detective · First-Person

The Exit 8
Shared: Puzzle · Walking Simulator · Horror

MiSide
Shared: First-Person · Horror · 3D

Unheard - Voices of Crime
Shared: Detective · Puzzle · Thriller

INSIDE
Shared: Puzzle Platformer · Horror · Puzzle

Garten of Banban 2
Shared: Puzzle · First-Person · Horror

LIMBO
Shared: Puzzle Platformer · Puzzle · Indie

Little Nightmares
Shared: Puzzle Platformer · Puzzle · Horror

SchoolBoy Runaway
Shared: Puzzle · Horror · First-Person

Outer Wilds
Shared: Space · Puzzle · First-Person

Firework
Shared: Puzzle · Horror · Indie

Kona
Shared: First-Person · Detective · Walking Simulator

Viewfinder
Shared: Puzzle Platformer · Puzzle · First-Person

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

The Painscreek Killings
Shared: Detective · Puzzle · Walking Simulator

Killer Frequency
Shared: Puzzle · Horror · First-Person

COCOON
Shared: Puzzle · Puzzle Platformer · 3D

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

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