Games like Only a Billion?!
Games like Only a Billion?! include Cookie Clicker, Nodebuster, Banana, Touhou Mystia's Izakaya, and Game Dev Tycoon. We matched them by the tags players give Only a Billion?! on Steam (Simulation, Strategy, Casual, Time Management, and Incremental): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Incremental · Casual · Collectathon

Nodebuster
Shared: Strategy · Casual · Simulation

Banana
Shared: Incremental · Casual · Simulation

Touhou Mystia's Izakaya
Shared: Simulation · Casual · Time Management

Game Dev Tycoon
Shared: Simulation · Strategy · Casual

Papa's Freezeria Deluxe
Shared: Simulation · Time Management · Casual

Mini Motorways
Shared: Simulation · Strategy · Casual

Plague Inc: Evolved
Shared: Simulation · Strategy · Casual

A Game About Feeding A Black Hole
Shared: Casual · Strategy · Incremental

Mini Metro
Shared: Strategy · Simulation · Casual

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · 2D

Russian Life Simulator
Shared: Simulation · Incremental · Strategy

BidKing
Shared: Strategy · Simulation · Casual

Fly Corp
Shared: Strategy · Casual · Time Management

112 Operator
Shared: Simulation · Casual · Time Management

Kiwi Clicker - Juiced Up
Shared: Casual · Incremental · Strategy

911 Operator
Shared: Simulation · Strategy · Casual

Digseum
Shared: Casual · Simulation · Incremental

Who's Your Daddy?!
Shared: Simulation · Strategy · Casual

Shelldiver
Shared: Casual · Incremental · Simulation

Loot Loop
Shared: Simulation · Casual · Incremental

Papa's Pizzeria Deluxe
Shared: Simulation · Casual · Strategy

Chef Knight
Shared: Strategy · Simulation · Incremental

xiuzhen idle
Shared: Casual · Simulation · Strategy