Games like GUG
Games like GUG include Totally Accurate Battle Simulator, SPORE™, Slime Rancher, Mewgenics, and Noita. We matched them by the tags players give GUG on Steam (Simulation, Sandbox, Turn-Based Tactics, Creature Collector, and Exploration): closest matches first, and among equally close ones the better-known games.

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Funny

SPORE™
Shared: Sandbox · Simulation · Exploration

Slime Rancher
Shared: Exploration · Sandbox · Simulation

Mewgenics
Shared: Turn-Based Tactics · Funny · Roguelite

Noita
Shared: Sandbox · Roguelike · Simulation

Kerbal Space Program
Shared: Simulation · Sandbox · Exploration

Legend Creatures(传奇生物)
Shared: Exploration · Roguelike · Strategy

Stellaris
Shared: Sandbox · Simulation · Strategy

Blackthorn Arena
Shared: Simulation · Turn-Based Tactics · Strategy

Goat Simulator
Shared: Simulation · Sandbox · Funny

Elin
Shared: Roguelike · Sandbox · Simulation

Prison Architect
Shared: Simulation · Sandbox · Strategy

鬼谷八荒 Tale of Immortal
Shared: Simulation · Sandbox · Exploration

Game Dev Tycoon
Shared: Simulation · Strategy · Sandbox

People Playground
Shared: Sandbox · Simulation · Funny

Two Point Museum
Shared: Simulation · Sandbox · Strategy

Dwarf Fortress
Shared: Simulation · Sandbox · Strategy

MyVoiceZoo
Shared: Simulation · Sandbox · Creature Collector

Two Point Hospital
Shared: Simulation · Sandbox · Funny

Garry's Mod
Shared: Sandbox · Funny · Simulation

Ultimate Epic Battle Simulator
Shared: Simulation · Sandbox · Strategy

Planet Coaster
Shared: Simulation · Sandbox · Strategy

A Game About Digging A Hole
Shared: Sandbox · Exploration · Simulation

Luck be a Landlord
Shared: Simulation · Strategy · Roguelike