Games like The Hollow Keep
Games like The Hollow Keep include Papers, Please, The Escapists, Firework, Stardew Valley, and Graveyard Keeper. We matched them by the tags players give The Hollow Keep on Steam (Simulation, Pixel Graphics, Visual Novel, Indie, and 2D): closest matches first, and among equally close ones the better-known games.

Papers, Please
Shared: Simulation · Indie · Pixel Graphics

The Escapists
Shared: Pixel Graphics · Simulation · 2D

Firework
Shared: Indie · 2D · Horror

Stardew Valley
Shared: Pixel Graphics · Simulation · Indie

Graveyard Keeper
Shared: Pixel Graphics · Simulation · Indie

Milk outside a bag of milk outside a bag of milk
Shared: Visual Novel · Pixel Graphics · Indie

The Test
Shared: Simulation · Pixel Graphics · Visual Novel

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

People Playground
Shared: Simulation · 2D · Singleplayer

Cookie Clicker
Shared: Pixel Graphics · Indie · Horror

KinitoPET
Shared: Indie · 2D · Horror

Vampire Survivors
Shared: Pixel Graphics · 2D · Indie

The Binding of Isaac: Rebirth
Shared: Indie · Pixel Graphics · Singleplayer

Lobotomy Corporation | Monster Management Simulation
Shared: Simulation · Singleplayer · Horror

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · 2D · Horror

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

Summer Memories
Shared: Pixel Graphics · Simulation · Visual Novel

Skul: The Hero Slayer
Shared: Indie · Pixel Graphics · 2D

Game Dev Tycoon
Shared: Simulation · Indie · Singleplayer

CARRION
Shared: Pixel Graphics · Indie · Horror

The Escapists 2
Shared: Pixel Graphics · Simulation · 2D

Emily is Away Too
Shared: Simulation · Indie · Pixel Graphics

NEEDY STREAMER OVERLOAD
Shared: Visual Novel · Pixel Graphics · 2D

Beat Cop
Shared: Pixel Graphics · Indie · Simulation