Games like Wild West Simulator
Games like Wild West Simulator include Oxygen Not Included, RimWorld, Prison Architect, Dyson Sphere Program, and Manor Lords. We matched them by the tags players give Wild West Simulator on Steam (Simulation, Colony Sim, Sandbox, 3D, and Western): closest matches first, and among equally close ones the better-known games.

Oxygen Not Included
Shared: Colony Sim · Base Building · Resource Management

RimWorld
Shared: Colony Sim · Sandbox · Base Building

Prison Architect
Shared: Simulation · Sandbox · Colony Sim

Dyson Sphere Program
Shared: Simulation · Base Building · Open World

Manor Lords
Shared: Simulation · Base Building · Sandbox

Kingdoms and Castles
Shared: Colony Sim · Simulation · Sandbox

Dwarf Fortress
Shared: Colony Sim · Simulation · Base Building

Against the Storm
Shared: Simulation · Base Building · Colony Sim

SPORE™
Shared: Sandbox · Colony Sim · Simulation

Empires of the Undergrowth
Shared: Simulation · Colony Sim · Base Building

Banished
Shared: Colony Sim · Simulation · Sandbox

Space Engineers
Shared: Sandbox · Simulation · Open World

Factorio
Shared: Sandbox · Base Building · Resource Management

Satisfactory
Shared: Base Building · Open World · Sandbox

Norland
Shared: Simulation · Colony Sim · Base Building

Space Haven
Shared: Colony Sim · Base Building · Simulation

Workers & Resources: Soviet Republic
Shared: Simulation · Base Building · Colony Sim

Dawn of Man
Shared: Colony Sim · Simulation · Sandbox

Amazing Cultivation Simulator
Shared: Simulation · Sandbox · Colony Sim

Flotsam
Shared: Colony Sim · Sandbox · Base Building

Hydroneer
Shared: Sandbox · Base Building · Simulation

Global Rescue
Shared: Simulation · Sandbox · 3D

Foundation
Shared: Simulation · Sandbox · Resource Management

Planetbase
Shared: Colony Sim · Simulation · Base Building