Games like Excidio The Kaiju Simulator
Games like Excidio The Kaiju Simulator include Goat Simulator, Garry's Mod, Totally Accurate Battle Simulator, People Playground, and GoreBox. We matched them by the tags players give Excidio The Kaiju Simulator on Steam (Villain Protagonist, Sandbox, Dinosaurs, Physics, and PvE): closest matches first, and among equally close ones the better-known games.

Goat Simulator
Shared: Sandbox · Physics · Simulation

Garry's Mod
Shared: Sandbox · Physics · Casual

Totally Accurate Battle Simulator
Shared: Sandbox · Physics · Simulation

People Playground
Shared: Sandbox · Physics · Simulation

GoreBox
Shared: Sandbox · Physics · PvE

Besiege
Shared: Sandbox · Physics · PvE

Teardown
Shared: Sandbox · Physics · Destruction

Animal Revolt Battle Simulator
Shared: Sandbox · Dinosaurs · Physics

Fun with Ragdolls: The Game
Shared: Sandbox · Physics · 3D

BeamNG.drive
Shared: Physics · Sandbox · Simulation

Goat Simulator 3
Shared: Sandbox · Physics · 3D

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Physics · 3D

Space Engineers
Shared: Sandbox · Physics · Simulation

Nuclear Option
Shared: Physics · Action · Simulation

Totally Reliable Delivery Service
Shared: Sandbox · Physics · Action

Brickadia
Shared: Sandbox · Physics · 3D

CarX Drift Racing Online
Shared: Sandbox · Physics · Simulation

Half Sword
Shared: Physics · Sandbox · Action

STANDBOX
Shared: Sandbox · Physics · 3D

Turbo Dismount™
Shared: Physics · Sandbox · Simulation

Kerbal Space Program
Shared: Sandbox · Physics · Simulation

ALTF4
Shared: Physics · Arcade · Third Person

BONEWORKS
Shared: Sandbox · Physics · Action

Wreckfest
Shared: Physics · Simulation · Action