Games like Aethernaut
Games like Aethernaut include Portal, Portal 2, The Talos Principle, Outer Wilds, and The Talos Principle 2. We matched them by the tags players give Aethernaut on Steam (Puzzle, Puzzle Platformer, First-Person, 3D Platformer, and Singleplayer): closest matches first, and among equally close ones the better-known games.
Portal
Shared: Puzzle · Puzzle Platformer · First-Person
Portal 2
Shared: Puzzle · Singleplayer · First-Person
The Talos Principle
Shared: Puzzle · First-Person · Sci-fi
Outer Wilds
Shared: Exploration · Puzzle · Story Rich
The Talos Principle 2
Shared: Puzzle · First-Person · Puzzle Platformer
Viewfinder
Shared: Puzzle · Puzzle Platformer · First-Person
What Remains of Edith Finch
Shared: First-Person · Story Rich · Exploration
Supraland
Shared: Puzzle Platformer · First-Person · Exploration
Fallout 4
Shared: Singleplayer · Exploration · First-Person
The Turing Test
Shared: Puzzle · First-Person · Sci-fi
Blue Prince
Shared: Puzzle · Exploration · Singleplayer
Sable
Shared: Exploration · Atmospheric · Story Rich
Firewatch
Shared: First-Person · Singleplayer · Story Rich
The Witness
Shared: Puzzle · First-Person · Exploration
A Story About My Uncle
Shared: First-Person · Singleplayer · Puzzle
FAR: Lone Sails
Shared: Singleplayer · Puzzle · Exploration
Little Nightmares
Shared: Puzzle Platformer · Puzzle · Singleplayer
Cyberpunk 2077
Shared: Singleplayer · First-Person · Sci-fi
Indiana Jones and the Great Circle
Shared: First-Person · Puzzle · Singleplayer
The Entropy Centre
Shared: Puzzle · First-Person · Sci-fi
Rise of the Tomb Raider™
Shared: Singleplayer · Female Protagonist · Puzzle
COCOON
Shared: Puzzle · Puzzle Platformer · Exploration
Mirror's Edge™
Shared: First-Person · 3D Platformer · Puzzle
The Last Campfire
Shared: Puzzle · Singleplayer · Atmospheric