Top similar games like Rat Overflow:

A calm artificial-life sandbox where you seed tiny Neeblies into biomes, watch families and traits emerge, and preserve rare discoveries in your Lab. Shape the environment, run parallel ecosystems, and decide when to intervene or let evolution unfold.

Enjoy watching cute hand animated dinosaurs inspired by 90's Tamagotchi live directly on your desktop. Manage your environment, resources to raise and evolve your dinosaurs during their entire life. But don't forget to show them love! Dinosaurs need love!

A relaxing idle digging game that sits at the corner of your screen. Work (or don't) while your best friend digs for items, collects treasures and unlocks new biomes and outfits.

Decorate your own aquariums and care for a variety of fish in Fishlets, a cozy fish-collecting sim! Feed, breed, sell, and collect fish and aquatic critters in the virtual tanks mode. Drop into Adventure mode and progress through 7 unique levels, unlocking even more fish while fending off threats!

Creature Evolution is a game about merging little creatures and seeing what they turn into. You start with a few small critters, and by combining them, they slowly change into new and sometimes unexpected forms. The more you merge, the stranger and bigger they grow.

Explore real digital life in The Bibites! Play god by guiding your bibites on their evolutionary journey or engineer your own. Analyze their Neural Network brains and genetic information as they adapt to their environments. Save your favorites and test their strength in Challenge Mode!

Adopt a living desktop pet, or make your own. Import your art, wire simple behaviors on a visual node graph, and watch it walk, idle, etc, and tumble across your real desktop. A cozy little studio for building the companion your screen's been missing.

Grow, feed and care for your colony of adorable isopods in this realistic semi-idle simulator. Watch your isopods multiply and split or sell your colony if they become too numerous. Created by the Kunstaat community, 100% of our proceeds support charity!

Retro virtual pet game with total fidelity to the 90s classics. A pixel art simulator with multiple characters, including rare pets, where your choices shape the evolution of your virtual pet.

Reefling is a calm desktop aquarium that sits in the corner of your screen. Feed your fish with a click, earn shells over time, and collect over 150 pixel-art species. Decorate the tank and watch day turn to night. Your fish never starve and you can't lose, so just relax while you work.

Rare Rabbits is an adorable, turn-based simulation game where you can already breed more than 6,000,000 unique rabbits and manage your very own rabbit farm. Each rabbit’s appearance and traits are determined by scientifically accurate genetics and inheritance principles, down to the smallest allele!

A cozy desktop idle game that runs quietly in the background. River sand is sifted to discover minerals and build a small museum collection.

Paw by paw, pixel by pixel grow alongside your hand-drawn desktop companions. Play at your own pace, free from timer stress, and make a real-world impact with every step you take.

🦕 Dino Park is a cozy idle game about collecting dinosaurs! 🦖 Watch your dinosaurs level up in real time, earning more money for your park. Create the perfect environment for your dinosaurs to increase the chance of discovering super rare variants! Can you collect them all?

Catch 200+ real life bugs in this peaceful creature collector. You’ve bought the local insectarium (bug zoo) in the cozy town of Buggburg, so start swinging your net to build your dream bug collection and create the best insectarium Buggburg has ever seen.

Build a living pond where every fish has a unique genetic code. Breed for rare traits, balance oxygen and hunger, unlock new species, and watch your ecosystem compose its own soundtrack in real time. Part sim, part idle game, part science experiment gone beautifully wrong.

Backyard Birdwatching is your virtual window to a relaxing afternoon in the Midwest. It's a simple, colorful management sim that teaches you about birds and how to attract them to your yard.

Grow, feed and care for your shrimp pals. Watch your shrimp multiply and sell your colony when they become too numerous.

Discover and collect cute Dino Girls, organize their activities, and expand your resort while going about your daily stuff.

Idlequarium is a casual simulation game where you raise adorable little fish to earn coins, purchase decorations, and build a fully customized aquarium.The game sits anywhere on your desktop, letting you interact with your live aquarium during work or study breaks.

Wing It is a relaxing simulation game where you build and manage a bird sanctuary. Discover, care for, and unlock diverse bird species, customize your haven with unique decor, and explore new locations to expand your sanctuary. Create a paradise for your feathered friends!

Run your own cozy fish shop, collect unique breeds, care for your tanks, and decorate your home. Breed rare fish, manage customers, and grow your store. Build, customize, and create the aquarium life you dream of.

Wing Haven is a relaxing idle game about building cozy bird sanctuaries. Collect rare and exotic feathered friends, give them plant shelter, and watch them grow in real-time! Progress from a basic enclosure to a beautiful nature preserve in old-growth forest, desert oasis, or wetland climates!

Build and manage a cozy idle supermarket run by cute animals at the bottom of your screen. Produce goods, stock shelves, automate your store, hire employees and expand your tiny market.

Little Aviary is a relaxing idle bird collector that sits at the bottom of your screen! Hatch unique birds, sell them, decorate, then watch them fly around your screen and perch on top of your other windows!

Dive into Purrounding and customize your very own cat! Watch as your adorable feline strolls across your taskbar, and create the perfect workspace with a variety of furniture pieces. Boost your productivity with a Pomodoro timer and chill out to some lo-fi tunes while you work!

Build your own little underwater escape. Collect colorful fish, raise new generations, and decorate three cozy 2.5D habitats. Feed, grow, breed, or simply enjoy the view — a relaxing singleplayer aquarium, playable offline.

A desktop hunting game. Catch tiny creatures that appear on your desktop, bring them to your peaceful garden 🏝️ Take care of them as they grow, evolve, and fill your space with quiet cozy life.

Welcome to the Isle of Lost Bees, a cozy idle game where you and your collection of Australian bees harvest pollen, research flowers, and uncover the island’s secrets. You're a bee-obsessed researcher on an island devoid of humans. You never seemed to need human contact anyway.

A relaxing idle fishing game that waits for you at the bottom of your screen. CATCH fish, BUY upgrades, COMPLETE your collection, and DISPLAY them in your aquarium.

Have you ever wanted a hyper-realistic industrial chicken farming simulator? Us neither. Design your own farm from the ground up and watch it whimsically expand as you work to reconstruct long forgotten legendary chicken genomes. With so many paths to take, what will YOU choose to create first?

Manage a care center for adorable monsters in Monster Care Simulator! Treat clients' creatures, hatch eggs, raise your own companions, and keep them happy with fun activities. Hire staff, expand your facilities, and customize your space to build the ultimate monster sanctuary!

A relaxing, idle boba-shop simulator that can accompany you as you work on other things. Sell boba tea, unlock new drinks, and customize and care for a boba pet that lives in the corner of your screen!

A cozy management sim where the jazz is smooth, the cocktails are cooler than the evening breeze, and the lake reflects your perfect escape.

"My Aquarium" runs at the bottom of the screen while you are doing other things, making it an idle aquarium simulator you can enjoy comfortably.

Learn to Make Millions in this Cozy Merchant Sim. Build a business and beat the competition to become the biggest merchant in the world by learning smart financial habits, behaviors and traits. Craft pies & jams from tons of different berries. Have fun running your shop & helping your community!