Games like The Space Garden
Games like The Space Garden include Stardew Valley, Cookie Clicker, Banana, Starbound, and Graveyard Keeper. We matched them by the tags players give The Space Garden on Steam (Indie, Casual, Space, Incremental, and Agriculture): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Pixel Graphics · Agriculture · Indie

Cookie Clicker
Shared: Incremental · Casual · Indie

Banana
Shared: Incremental · Casual · 2D

Starbound
Shared: Space · Sandbox · Pixel Graphics

Graveyard Keeper
Shared: Pixel Graphics · Indie · Simulation

Terraria
Shared: 2D · Pixel Graphics · Sandbox

Kerbal Space Program
Shared: Space · Indie · Sandbox

Tiny Pasture
Shared: Incremental · Casual · Pixel Graphics

Solar 2
Shared: Indie · Space · Casual

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Management

Space Engineers
Shared: Space · Sandbox · Open World

Game Dev Tycoon
Shared: Indie · Casual · 2D

My Time at Portia
Shared: Casual · Open World · Indie

Shelldiver
Shared: Casual · Incremental · 2D

Unpacking
Shared: Casual · Pixel Graphics · Indie

Voodoo Garden
Shared: Casual · Indie · Incremental

SPORE™
Shared: Space · Casual · Open World

Click the Button
Shared: Indie · Casual · Incremental

Touhou Mystia's Izakaya
Shared: Casual · Pixel Graphics · Simulation

Papers, Please
Shared: Indie · Pixel Graphics · Simulation

People Playground
Shared: 2D · Sandbox · Indie

Littlewood
Shared: Pixel Graphics · Agriculture · Casual

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

Farm Together
Shared: Agriculture · Casual · Simulation