Games like Red Trigger
Games like Red Trigger include Portal, Portal 2, Neon White, Half-Life 2, and Half-Life: Alyx. We matched them by the tags players give Red Trigger on Steam (3D Platformer, Puzzle Platformer, FPS, Puzzle, and Parkour): closest matches first, and among equally close ones the better-known games.

Portal
Shared: Puzzle Platformer · 3D Platformer · Puzzle

Portal 2
Shared: Puzzle · Puzzle Platformer · 3D Platformer

Neon White
Shared: 3D Platformer · FPS · Parkour

Half-Life 2
Shared: FPS · Shooter · Action

Half-Life: Alyx
Shared: FPS · Shooter · Female Protagonist

BioShock Infinite
Shared: FPS · Shooter · First-Person

Severed Steel
Shared: FPS · Parkour · Shooter

Titanfall® 2
Shared: FPS · Shooter · Parkour

Mirror's Edge™ Catalyst
Shared: Parkour · 3D Platformer · Female Protagonist

Bright Memory
Shared: FPS · Female Protagonist · Shooter

Supraland
Shared: Puzzle Platformer · Puzzle · FPS

The Talos Principle 2
Shared: Puzzle · Puzzle Platformer · 3D Platformer

VLADiK BRUTAL
Shared: FPS · Shooter · Puzzle

PUBG: BATTLEGROUNDS
Shared: FPS · Shooter · Strategy

Black Mesa
Shared: FPS · Shooter · First-Person

Mirror's Edge™
Shared: 3D Platformer · Parkour · Female Protagonist

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

A Story About My Uncle
Shared: Parkour · 3D Platformer · First-Person

Viewfinder
Shared: Puzzle Platformer · Puzzle · First-Person

Refunct
Shared: 3D Platformer · Parkour · Puzzle Platformer

Echo Point Nova
Shared: FPS · Shooter · Parkour

Bright Memory: Infinite
Shared: FPS · Female Protagonist · Shooter

SUPERHOT
Shared: FPS · Puzzle · Shooter

Call of Duty®: Black Ops III
Shared: FPS · Shooter · First-Person