Games like Petunia's Purgatory
Games like Petunia's Purgatory include Rusty's Retirement, Tiny Pasture, Cookie Clicker, DAVE THE DIVER, and Shelldiver. We matched them by the tags players give Petunia's Purgatory on Steam (Idler, Farming Sim, Desktop Companion, Management, and Casual): closest matches first, and among equally close ones the better-known games.

Rusty's Retirement
Shared: Idler · Farming Sim · Desktop Companion

Tiny Pasture
Shared: Idler · Farming Sim · Cute

Cookie Clicker
Shared: Idler · Casual · Management

DAVE THE DIVER
Shared: Management · Casual · Pixel Graphics

Shelldiver
Shared: Casual · Idler · Management

Maltese's Fluffy Onsen
Shared: Desktop Companion · Idler · Casual

How to Train Your Cock
Shared: Idler · Desktop Companion · Casual

Stardew Valley
Shared: Farming Sim · Pixel Graphics · Casual

Ropuka's Idle Island
Shared: Idler · Desktop Companion · Casual

Tiny Terraces
Shared: Idler · Farming Sim · Casual

Cornerpond
Shared: Idler · Desktop Companion · Casual

Spirit City: Lofi Sessions
Shared: Desktop Companion · Idler · Casual

Digseum
Shared: Idler · Casual · Management

Your Big, Cute Monster Farm
Shared: Farming Sim · Idler · Casual

Potion Craft: Alchemist Simulator
Shared: Management · Singleplayer · Casual

Lakeside Bar
Shared: Idler · Desktop Companion · Cute

Village Tale
Shared: Idler · Desktop Companion · Farming Sim

Crusaders Quest : Hero Town
Shared: Desktop Companion · Idler · Cute

Cast n Chill
Shared: Idler · Pixel Graphics · Desktop Companion

Travellers Rest
Shared: Farming Sim · Management · Pixel Graphics

Farm Manager 2018
Shared: Farming Sim · Management · Casual

Game Dev Tycoon
Shared: Management · Casual · Simulation

Fish to Dish: Idle Sushi
Shared: Idler · Desktop Companion · Casual

(the) Gnorp Apologue
Shared: Idler · Management · Cute