Games like Keymaker
Games like Keymaker include Papers, Please, OneShot, There Is No Game: Wrong Dimension, Gunpoint, and Firework. We matched them by the tags players give Keymaker on Steam (Puzzle, Match 3, 2D, Noir, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Papers, Please
Shared: Pixel Graphics · Puzzle · Indie

OneShot
Shared: Pixel Graphics · Puzzle · Indie

There Is No Game: Wrong Dimension
Shared: Puzzle · Indie · Pixel Graphics

Gunpoint
Shared: Puzzle · 2D · Pixel Graphics

Firework
Shared: Puzzle · 2D · Indie

Baba Is You
Shared: Puzzle · Indie · Pixel Graphics

10,000,000
Shared: Match 3 · Puzzle · Pixel Graphics

Thimbleweed Park™
Shared: Puzzle · Pixel Graphics · Indie

KinitoPET
Shared: 2D · Indie · Retro

DISTRAINT: Deluxe Edition
Shared: 2D · Pixel Graphics · Indie

Zuma Deluxe
Shared: Puzzle · Match 3 · 2D

CrossCode
Shared: Puzzle · Pixel Graphics · 2D

FEZ
Shared: Puzzle · Pixel Graphics · Indie

Unpacking
Shared: Puzzle · Pixel Graphics · Casual

Undertale
Shared: Pixel Graphics · Story Rich · 2D

Samsara Room
Shared: Puzzle · Indie · Free to Play

SANABI
Shared: Pixel Graphics · 2D · Story Rich

Pony Island
Shared: Puzzle · Pixel Graphics · Indie

Gorogoa
Shared: Puzzle · Indie · 2D

Vampire Survivors
Shared: Pixel Graphics · 2D · Indie

To the Moon
Shared: Pixel Graphics · Indie · Story Rich

Tales of the Black Forest
Shared: Pixel Graphics · Indie · Puzzle

A Bird Story
Shared: Pixel Graphics · Indie · 2D

The Rewinder
Shared: Puzzle · Pixel Graphics · 2D