Games like Eschaton
Games like Eschaton include The Witness, Manifold Garden, The Vanishing of Ethan Carter, Moncage, and The Talos Principle. We matched them by the tags players give Eschaton on Steam (Surreal, Conspiracy, Philosophical, Supernatural, and Mystery): closest matches first, and among equally close ones the better-known games.

The Witness
Shared: Exploration · Puzzle · Mystery

Manifold Garden
Shared: Surreal · Exploration · Puzzle

The Vanishing of Ethan Carter
Shared: Mystery · Exploration · Detective

Moncage
Shared: Surreal · Puzzle · Experimental

The Talos Principle
Shared: Philosophical · Puzzle · Exploration

Obduction
Shared: Surreal · Exploration · Mystery

Firewatch
Shared: Mystery · Exploration · Adventure

The Painscreek Killings
Shared: Mystery · Exploration · Detective

Antichamber
Shared: Surreal · Exploration · Puzzle

What Remains of Edith Finch
Shared: Mystery · Exploration · Walking Simulator

Outer Wilds
Shared: Mystery · Exploration · Puzzle

The Unfinished Swan
Shared: Surreal · Exploration · Puzzle

Murdered: Soul Suspect
Shared: Supernatural · Mystery · Detective

The Mortuary Assistant
Shared: Supernatural · Surreal · Mystery

Blue Prince
Shared: Mystery · Exploration · Puzzle

The Beginner's Guide
Shared: Surreal · Walking Simulator · Indie

Return of the Obra Dinn
Shared: Mystery · Detective · Puzzle

Chants of Sennaar
Shared: Puzzle · Adventure · Singleplayer

Riven
Shared: Exploration · Mystery · Puzzle

Murders on the Yangtze River
Shared: Mystery · Detective · Exploration

Ghostwire: Tokyo
Shared: Supernatural · Surreal · Singleplayer

The Séance of Blake Manor
Shared: Supernatural · Mystery · Detective

Jazzpunk: Director's Cut
Shared: Surreal · Exploration · Indie

The Exit 8
Shared: Exploration · Surreal · Puzzle