Games like Horsey Game
Games like Horsey Game include Stardew Valley, WorldBox - God Simulator, Graveyard Keeper, Moonstone Island, and People Playground. We matched them by the tags players give Horsey Game on Steam (Simulation, Creature Collector, Life Sim, Sandbox, and 2D): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Life Sim · Simulation · Pixel Graphics

WorldBox - God Simulator
Shared: Simulation · Sandbox · Life Sim

Graveyard Keeper
Shared: Simulation · Pixel Graphics · Sandbox

Moonstone Island
Shared: Creature Collector · 2D · Sandbox

People Playground
Shared: Sandbox · Simulation · 2D

Fields of Mistria
Shared: Life Sim · Simulation · Pixel Graphics

Big Ambitions
Shared: Simulation · Life Sim · Sandbox

Littlewood
Shared: Life Sim · Simulation · Pixel Graphics

Let's Build a Zoo
Shared: Simulation · Sandbox · Creature Collector

Noita
Shared: Sandbox · Pixel Graphics · 2D

Terraria
Shared: Sandbox · 2D · Pixel Graphics

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

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Colorful

Potion Craft: Alchemist Simulator
Shared: Simulation · 2D · Sandbox

Supermarket Simulator
Shared: Simulation · Life Sim · Management

Clanfolk
Shared: Life Sim · Simulation · Pixel Graphics

Prison Architect
Shared: Simulation · Sandbox · 2D

Farming Simulator 22
Shared: Simulation · Sandbox · Agriculture

Planet Centauri
Shared: Sandbox · Creature Collector · 2D

Kerbal Space Program
Shared: Simulation · Sandbox · Science

The Ranch of Rivershine
Shared: Simulation · Life Sim · Horses

My Time at Portia
Shared: Life Sim · Simulation · Sandbox

Game Dev Tycoon
Shared: Simulation · 2D · Management

TheoTown
Shared: Simulation · Sandbox · Pixel Graphics