Games like Gravity Well
Games like Gravity Well include Portal, Portal 2, SUPERHOT, Bright Memory: Infinite, and The Talos Principle. We matched them by the tags players give Gravity Well on Steam (Action, Indie, First-Person, Sci-fi, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Portal
Shared: First-Person · Puzzle Platformer · Puzzle

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

SUPERHOT
Shared: Action · Indie · First-Person

Bright Memory: Infinite
Shared: Action · Indie · Sci-fi

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

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

Defy Gravity Extended
Shared: Indie · Puzzle Platformer · Action

Polarity
Shared: Indie · First-Person · Puzzle

Half-Life 2
Shared: Action · Sci-fi · First-Person

Starship Troopers: Extermination
Shared: Action · Sci-fi · First-Person

The Ball
Shared: First-Person · Puzzle Platformer · Action

Q.U.B.E. 2
Shared: Action · Indie · First-Person

Q.U.B.E: Director's Cut
Shared: Indie · First-Person · Action

LIMBO
Shared: Indie · Puzzle Platformer · Puzzle

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

The Talos Principle 2
Shared: First-Person · Puzzle · Sci-fi

MO:Astray
Shared: Action · Indie · Puzzle Platformer

Deliver Us The Moon
Shared: Indie · Action · Sci-fi

DeadCore
Shared: Action · Indie · First-Person

Human Fall Flat
Shared: Puzzle · Action · Puzzle Platformer

Angels Fall First
Shared: Action · Indie · Sci-fi

BioShock Infinite
Shared: Action · First-Person · Sci-fi

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

LOCKDOWN Protocol
Shared: Action · First-Person · Sci-fi