Games like Readerpet
Games like Readerpet include Stardew Valley, Tiny Pasture, Palia, Maltese's Fluffy Onsen, and Screen Cat. We matched them by the tags players give Readerpet on Steam (Idler, Casual, Simulation, Cats, and Cozy): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Farming Sim · Simulation · Life Sim

Tiny Pasture
Shared: Idler · Casual · Farming Sim

Palia
Shared: Cozy · Life Sim · Farming Sim

Maltese's Fluffy Onsen
Shared: Simulation · Casual · Idler

Screen Cat
Shared: Casual · Cats · Idler

Spirit City: Lofi Sessions
Shared: Cozy · Idler · Casual

Cast n Chill
Shared: Idler · Cozy · Casual

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

Rusty's Retirement
Shared: Idler · Farming Sim · Simulation

Travellin Cats in Paris
Shared: Cats · Casual · Cozy

Little Witch in the Woods
Shared: Casual · Simulation · Life Sim

Sticky Business
Shared: Casual · Simulation · Cute

MyVoiceZoo
Shared: Casual · Simulation · Idler

Unpacking
Shared: Casual · Simulation · Cute

Minami Lane
Shared: Casual · Simulation · Life Sim

Your Big, Cute Monster Farm
Shared: Casual · Simulation · Idler

Cookie Clicker
Shared: Idler · Casual · Pixel Graphics

Luma Island
Shared: Casual · Cozy · Simulation

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

How to Train Your Cock
Shared: Idler · Casual · Cozy

Tales of the Shire: A The Lord of The Rings™ Game
Shared: Casual · Cozy · Life Sim

Little Kitty, Big City
Shared: Cats · Cozy · Cute

Chill Pulse
Shared: Casual · Idler · Simulation

Hello Kitty Island Adventure
Shared: Cozy · Simulation · Casual