Games like Billionaire Simulator
Games like Billionaire Simulator include Crusader Kings III, Reus, Russian Life Simulator, Game Dev Tycoon, and Ultimate Epic Battle Simulator 2. We matched them by the tags players give Billionaire Simulator on Steam (Simulation, Capitalism, God Game, Strategy, and Inventory Management): closest matches first, and among equally close ones the better-known games.

Crusader Kings III
Shared: Simulation · Strategy · Grand Strategy

Reus
Shared: God Game · Simulation · Strategy

Russian Life Simulator
Shared: Simulation · Capitalism · Strategy

Game Dev Tycoon
Shared: Simulation · Strategy · Casual

Ultimate Epic Battle Simulator 2
Shared: Simulation · Strategy · God Game

Big Ambitions
Shared: Simulation · Capitalism · Life Sim

Plague Inc: Evolved
Shared: Simulation · Strategy · Casual

Supermarket Simulator
Shared: Simulation · Capitalism · Life Sim

SPORE™
Shared: God Game · Simulation · Sandbox

Victoria 3
Shared: Simulation · Strategy · Grand Strategy

911 Operator
Shared: Simulation · Strategy · Casual

BidKing
Shared: Simulation · Strategy · Casual

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

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox

Two Point Museum
Shared: Simulation · Strategy · Casual

Stellaris
Shared: Strategy · Grand Strategy · Simulation

Crusader Kings II
Shared: Strategy · Simulation · Grand Strategy

Manor Lords
Shared: Simulation · Strategy · Grand Strategy

House Flipper
Shared: Simulation · Casual · Sandbox

Stardew Valley
Shared: Simulation · Life Sim · Sandbox

Europa Universalis IV
Shared: Simulation · Strategy · Grand Strategy

Cities: Skylines
Shared: Simulation · Strategy · Sandbox

Prison Architect
Shared: Simulation · Strategy · Sandbox

Banana
Shared: Simulation · Casual · Incremental