Games like Flower Planet
Games like Flower Planet include Slime Rancher 2, Stardew Valley, Sticky Business, Potion Craft: Alchemist Simulator, and Unpacking. We matched them by the tags players give Flower Planet on Steam (Simulation, Casual, 2D, Farming Sim, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Slime Rancher 2
Shared: Cute · Singleplayer · Simulation

Stardew Valley
Shared: Farming Sim · Simulation · Relaxing

Sticky Business
Shared: Casual · Simulation · Cute

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

Unpacking
Shared: Casual · Cute · Simulation

Slime Rancher
Shared: Cute · Singleplayer · Simulation

Passpartout: The Starving Artist
Shared: Simulation · Casual · Singleplayer

Placid Plastic Duck Simulator
Shared: Casual · Cute · Simulation

Zup! S
Shared: Casual · 2D · Singleplayer

Cat Goes Fishing
Shared: 2D · Casual · Cute

Voodoo Garden
Shared: Casual · Farming Sim · Simulation

DAVE THE DIVER
Shared: Casual · Singleplayer · Simulation

Farm Together
Shared: Simulation · Casual · Farming Sim

A Little to the Left
Shared: Casual · Cute · Relaxing

Is This Seat Taken?
Shared: Casual · Cute · Relaxing

Game Dev Tycoon
Shared: Simulation · Casual · Singleplayer

Mini Motorways
Shared: Simulation · Casual · Singleplayer

Townscaper
Shared: Casual · Simulation · Relaxing

Paleo Pines
Shared: Farming Sim · Casual · Simulation

STORY OF SEASONS: Friends of Mineral Town
Shared: Simulation · Casual · Farming Sim

Mini Metro
Shared: Simulation · Casual · Singleplayer

A Game About Feeding A Black Hole
Shared: Casual · Simulation · 2D

Minami Lane
Shared: Casual · Simulation · Cute

Mountain
Shared: Simulation · Casual · Singleplayer