Games like Hay! One Billion!
Games like Hay! One Billion! include Leaf it Alone, ReStory: Chill Electronics Repairs, Dressmaker, House Flipper, and Potion Craft: Alchemist Simulator. We matched them by the tags players give Hay! One Billion! on Steam (Incremental, Simulation, Relaxing, Cozy, and Job Simulator): closest matches first, and among equally close ones the better-known games.

Leaf it Alone
Shared: Relaxing · Simulation · Incremental

ReStory: Chill Electronics Repairs
Shared: Cozy · Job Simulator · Relaxing

Dressmaker
Shared: Cozy · Simulation · Job Simulator

House Flipper
Shared: Simulation · Singleplayer · Relaxing

Potion Craft: Alchemist Simulator
Shared: Relaxing · Simulation · Singleplayer

Russian Life Simulator
Shared: Simulation · Incremental · Singleplayer

Slime Rancher 2
Shared: Relaxing · Singleplayer · Simulation

Banana
Shared: Incremental · Singleplayer · Simulation

Black Friday Janitor: Clean the Whole Mall
Shared: Simulation · Relaxing · Incremental

A Game About Feeding A Black Hole
Shared: Incremental · Relaxing · Simulation

Mountain
Shared: Simulation · Relaxing · Indie

Garden Life: A Cozy Simulator
Shared: Simulation · Relaxing · Cozy

Cat Mail Co.
Shared: Relaxing · Simulation · Cozy

Keep on Mining!
Shared: Incremental · Relaxing · Singleplayer

My Dream Setup
Shared: Relaxing · Simulation · Cozy

Crime Scene Cleaner
Shared: Simulation · Relaxing · Singleplayer

Paralives
Shared: Simulation · Indie · Relaxing

Bills Must Be Paid
Shared: Incremental · Relaxing · Indie

Tiny Eden
Shared: Simulation · Relaxing · Cozy

DinoBones: Tidy Up the Museum
Shared: Relaxing · Simulation · Job Simulator

Good Pizza, Great Pizza - Cooking Simulator Game
Shared: Simulation · Cozy · Relaxing

PowerWash Simulator
Shared: Relaxing · Simulation · 3D

Librarian: Tidy Up the Arcane Library!
Shared: Relaxing · Singleplayer · Simulation

KuloNiku: Bowl Up!
Shared: Simulation · Job Simulator · Singleplayer