Games like Gridworld
Games like Gridworld include WorldBox - God Simulator, RimWorld, 鬼谷八荒 Tale of Immortal, Kerbal Space Program, and Prison Architect. We matched them by the tags players give Gridworld on Steam (Simulation, Sandbox, Artificial Intelligence, Science, and Procedural Generation): closest matches first, and among equally close ones the better-known games.

WorldBox - God Simulator
Shared: Sandbox · Simulation · God Game

RimWorld
Shared: Sandbox · Colony Sim · Simulation

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

Kerbal Space Program
Shared: Simulation · Sandbox · Science

Prison Architect
Shared: Simulation · Sandbox · Colony Sim

The Sapling
Shared: Sandbox · Science · Simulation

Oxygen Not Included
Shared: Colony Sim · Sandbox · Simulation

SPORE™
Shared: Sandbox · Simulation · God Game

Graveyard Keeper
Shared: Simulation · Sandbox · Management

People Playground
Shared: Sandbox · Simulation · 2D

Thrive
Shared: Simulation · Sandbox · Science

Universe Sandbox
Shared: Simulation · Sandbox · Science

Planetary Life
Shared: Sandbox · Simulation · Science

Stardew Valley
Shared: Simulation · Sandbox · Pixel Graphics

The Universim
Shared: Sandbox · Colony Sim · God Game

Ages of Conflict: World War Simulator
Shared: Sandbox · Simulation · God Game

PC Building Simulator
Shared: Simulation · Sandbox · Management

Banished
Shared: Simulation · Colony Sim · Sandbox

Game Dev Tycoon
Shared: Simulation · Management · Sandbox

Sand:box
Shared: Simulation · Sandbox · God Game

Timberborn
Shared: Sandbox · Colony Sim · Management

Planet Zoo
Shared: Simulation · Sandbox · Management

Potion Craft: Alchemist Simulator
Shared: Simulation · Management · Sandbox

Cities: Skylines
Shared: Simulation · Sandbox · Management