Games like Circle Test Suite
Games like Circle Test Suite include Arma 3, Uncrashed : FPV Drone Simulator, SUPERHOT, Nuclear Option, and MechWarrior 5: Clans. We matched them by the tags players give Circle Test Suite on Steam (Action, Simulation, Arcade, Immersive Sim, and Physics): closest matches first, and among equally close ones the better-known games.

Arma 3
Shared: Action · Simulation · Shooter

Uncrashed : FPV Drone Simulator
Shared: Simulation · Physics · Immersive Sim

SUPERHOT
Shared: Action · Time Manipulation · Bullet Time

Nuclear Option
Shared: Simulation · Action · Physics

MechWarrior 5: Clans
Shared: Action · Simulation · Immersive Sim

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Arcade · Action · Shooter

BONEWORKS
Shared: Action · Physics · Shooter

KovaaK's
Shared: Action · Simulation · Shooter

Project Wingman
Shared: Action · Arcade · Simulation

IRON NEST: Heavy Turret Simulator
Shared: Simulation · Action · Immersive Sim

Aimlabs
Shared: Simulation · Action · Shooter

Arma Reforger
Shared: Simulation · Action · Shooter

Hard Bullet
Shared: Action · Simulation · Physics

BeamNG.drive
Shared: Simulation · Physics · Realistic

Internet Cafe Simulator 2
Shared: Simulation · Arcade · First-Person

Contraband Police
Shared: Simulation · Action · First-Person

Endorphin Vice
Shared: Simulation · Physics · Action

Hot Dogs, Horseshoes & Hand Grenades
Shared: Simulation · Physics · Shooter

War Thunder
Shared: Action · Simulation · Flight

How to Fish
Shared: Physics · Action · First-Person

Bodycam
Shared: Simulation · Shooter · Realistic

DEATHLOOP
Shared: Action · Immersive Sim · First-Person

Totally Accurate Battle Simulator
Shared: Simulation · Physics · Action

Garry's Mod
Shared: Physics · Simulation · First-Person