Games like Rat Race
Games like Rat Race include Portal 2, Seen, DEEMO -Reborn-, A Dance of Fire and Ice, and Portal. We matched them by the tags players give Rat Race on Steam (Action, Puzzle, Rhythm, Runner, and 3D): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Dark Humor · Action

Seen
Shared: Puzzle · Action · Runner

DEEMO -Reborn-
Shared: Rhythm · Puzzle · 3D

A Dance of Fire and Ice
Shared: Rhythm · Level Editor · Action

Portal
Shared: Puzzle · Action · Singleplayer

Metal: Hellsinger
Shared: Rhythm · Action · Atmospheric

Geometry Dash
Shared: Rhythm · Level Editor · Action

Hatsune Miku: Project DIVA Mega Mix+
Shared: Rhythm · Action · 3D

VLADiK BRUTAL
Shared: Action · Puzzle · Dystopian

DJMAX RESPECT V
Shared: Rhythm · Action · 3D

Rhythm Doctor
Shared: Rhythm · Action · Level Editor

Snake Force
Shared: Action · 3D · Top-Down

BIT.TRIP RERUNNER
Shared: Runner · Rhythm · Action

Planet of Lana
Shared: Action · Puzzle · Atmospheric

Tomb Raider I-III Remastered Starring Lara Croft
Shared: Action · Puzzle · 3D

Black Myth: Wukong
Shared: Action · 3D · Atmospheric

Hi-Fi RUSH
Shared: Action · Rhythm · Singleplayer

I wanna be the Creator
Shared: Action · Puzzle · Level Editor

A Plague Tale: Requiem
Shared: Action · 3D · Realistic

Rise of the Tomb Raider™
Shared: Action · Puzzle · Singleplayer

Batman™: Arkham Knight
Shared: Action · Puzzle · Singleplayer

BIT.TRIP RUNNER
Shared: Rhythm · Action · Runner

Half-Life 2
Shared: Action · Dystopian · Singleplayer

BONEWORKS
Shared: Action · Puzzle · Realistic