Games like System of Souls
Games like System of Souls include Portal 2, Portal, The Talos Principle 2, Indiana Jones and the Great Circle, and Viewfinder. We matched them by the tags players give System of Souls on Steam (Puzzle, Action, Puzzle Platformer, First-Person, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Singleplayer · First-Person

Portal
Shared: Puzzle · Puzzle Platformer · First-Person

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

Indiana Jones and the Great Circle
Shared: Puzzle · First-Person · Singleplayer

Viewfinder
Shared: Puzzle · Puzzle Platformer · First-Person

Mirror's Edge™
Shared: First-Person · 3D Platformer · Puzzle

A Story About My Uncle
Shared: First-Person · Singleplayer · Puzzle

Half-Life 2
Shared: Action · Sci-fi · Singleplayer

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

Defy Gravity Extended
Shared: Puzzle Platformer · Puzzle · Action

LIMBO
Shared: Puzzle · Puzzle Platformer · Platformer

Black Mesa
Shared: Action · First-Person · Sci-fi

The Ball
Shared: Puzzle Platformer · Puzzle · 3D Platformer

BioShock Infinite
Shared: Action · First-Person · Singleplayer

In Sound Mind
Shared: Puzzle · Action · First-Person

Ori and the Will of the Wisps
Shared: Action · Singleplayer · Platformer

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

Bendy and the Dark Revival
Shared: Action · First-Person · Singleplayer

Seen
Shared: Puzzle · Singleplayer · Action

Cyberpunk 2077
Shared: Singleplayer · First-Person · Sci-fi

Superliminal
Shared: Puzzle · First-Person · Singleplayer

Polarity
Shared: Puzzle · First-Person · Action

EDGE
Shared: Puzzle · Puzzle Platformer · Action

Amnesia: Rebirth
Shared: Puzzle · First-Person · Singleplayer