Games like Night Shift at the Gym
Games like Night Shift at the Gym include Buckshot Roulette, Poppy Playtime, The Mortuary Assistant, Zoochosis, and Five Nights at Freddy's. We matched them by the tags players give Night Shift at the Gym on Steam (Indie, Horror, Simulation, Job Simulator, and 3D): closest matches first, and among equally close ones the better-known games.

Buckshot Roulette
Shared: Horror · Indie · First-Person

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

The Mortuary Assistant
Shared: Horror · Simulation · Indie

Zoochosis
Shared: Horror · 3D · Realistic

Five Nights at Freddy's
Shared: Horror · Indie · Singleplayer

MiSide
Shared: Horror · First-Person · 3D

No, I'm not a Human
Shared: Horror · Indie · Singleplayer

Garten of Banban
Shared: Horror · First-Person · Singleplayer

Totally Accurate Battle Simulator
Shared: Simulation · Indie · Physics

Quarantine Zone: The Last Check
Shared: Simulation · First-Person · Singleplayer

Outlast
Shared: Horror · First-Person · Atmospheric

IRON NEST: Heavy Turret Simulator
Shared: Simulation · Indie · 3D

Bendy and the Ink Machine
Shared: Horror · First-Person · Indie

PC Building Simulator
Shared: Simulation · First-Person · 3D

Uncrashed : FPV Drone Simulator
Shared: Simulation · Physics · Realistic

Subliminal
Shared: Realistic · Horror · Singleplayer

HELLMART
Shared: Horror · Simulation · First-Person

Visage
Shared: Horror · First-Person · Indie

Supermarket Simulator
Shared: Simulation · First-Person · Singleplayer

Liftoff®: FPV Drone Racing
Shared: Simulation · Indie · First-Person

Electrician Simulator
Shared: Simulation · Indie · First-Person

Five Nights at Freddy's: Sister Location
Shared: Horror · First-Person · Indie

Locked Up
Shared: Indie · Horror · Simulation

Farming Simulator 25
Shared: Simulation · 3D · Realistic