Games like Garden Buddies
Games like Garden Buddies include Stardew Valley, My Time at Portia, Coral Island, Dinkum, and I Am Future: Cozy Apocalypse Survival. We matched them by the tags players give Garden Buddies on Steam (Farming Sim, Life Sim, RPG, Relaxing, and Agriculture): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Farming Sim · Life Sim · RPG

My Time at Portia
Shared: Life Sim · RPG · Farming Sim

Coral Island
Shared: Farming Sim · Life Sim · Relaxing

Dinkum
Shared: Farming Sim · Relaxing · Agriculture

I Am Future: Cozy Apocalypse Survival
Shared: Farming Sim · RPG · Agriculture

Starsand Island
Shared: Farming Sim · Life Sim · RPG

Fields of Mistria
Shared: Farming Sim · RPG · Life Sim

Clanfolk
Shared: Farming Sim · Life Sim · RPG

Palia
Shared: Life Sim · Farming Sim · Relaxing

Littlewood
Shared: Life Sim · Relaxing · RPG

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

Sun Haven
Shared: Farming Sim · Life Sim · RPG

No Place Like Home
Shared: Farming Sim · RPG · Life Sim

Disney Dreamlight Valley
Shared: Life Sim · Relaxing · Simulation

My Time at Sandrock
Shared: Life Sim · Farming Sim · RPG

Farmer's Dynasty - Final Harvest Edition
Shared: Farming Sim · Life Sim · RPG

Luma Island
Shared: Farming Sim · Simulation · Relaxing

Infinity Nikki
Shared: Relaxing · RPG · Life Sim

Farm Together
Shared: Agriculture · Relaxing · Farming Sim

The Sims™ 4
Shared: Life Sim · Simulation · Relaxing

Graveyard Keeper
Shared: RPG · Crafting · Simulation

Roots of Pacha
Shared: Farming Sim · Life Sim · Relaxing

Teddy's Haven
Shared: Relaxing · Simulation · Life Sim

Paralives
Shared: Life Sim · Simulation · Indie