Screenshots
Watch trailer on Steam ↗Koimori
Aurélien Dos Santos · Published by Aurélien Dos Santos
Last updated 28 Sept 2026
Turn your desktop into a living pond with this peaceful idle overlay. Let koi drift around while you work or relax, drop snacks to see them gather, and unlock rare koi patterns as you spend more time with your little friends.
Indie, Simulation, Casual · 2026 · More free games
Koimori invites you to relax by transforming your screen into a peaceful aquatic habitat. Watch koi glide through the water as you work or unwind, unlock unique patterns, and watch them gather when you offer snacks.
About this game
Koimori is a cozy desktop idle companion for Windows & Mac. Koi wander across your screen while you work or relax, offering a cute and comforting company without distracting you.
Designed to blend perfectly into your day, Koimori never pulls at your attention: there are no pings or alerts asking you to check in. Interact only when you feel like it, otherwise, your koi will happily take care of themselves and drift around in soothing movements.
Care for your koi, when you feel like it
Feed your little friends with snacks and watch them gather around you. Drop algae along the edges of your screen, and they’ll nibble on them whenever they get hungry.
If you keep them happy, you might discover new and rare kinds of koi...
More features to come!
For the full release, we're preparing:
More decorative items & snacks,
A wide range of koi patterns and shapes,
Nifty focus tools like a playful pomodoro timer.
Do you have more ideas? We wanna hear your feedback!
Consider supporting the development by adding the game to your wishlist.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS *: Windows 7
- Memory: 2 GB RAM
- DirectX: Version 11
- Storage: 200 MB available space
Recommended
- Requires a 64-bit processor and operating system
- OS *: Windows 8
- Memory: 4 GB RAM
- DirectX: Version 11
- Storage: 200 MB available space
Supported Languages
Latest news
AnnouncementsOfficial
How Koimori Began
So! Here we go, announcing my very first Steam page. Exciting!Koimori started as a small gift I made over the course of a week for my girlfriend. I wanted to create a little idle game to keep her company while she was studying. At first I went for the obvious idea: some kind of tamagotchi pet, maybe a cat hanging out at the bottom of the screen, with a yarn ball and a few toys. But her real-life cat had passed away just a few days before, so... that didn't feel like the best choice. Then I thought about the koi tattoo on her arm, and immediately it felt more personal. Also way sweeter and more romantic that a standard tamagotchi.I started tinkering in Unity. I knew a bit, but not that much, so animating my drawings to behave like a real koi was an interesting challenge. Sometimes they'd do weird stuff when trying to reach an alga, but most of the time it worked, and I felt like I'd nailed the vibe.During development, I sent test builds to a friend, who ended up keeping the app running for days while he worked. Completely unprompted! That's when I started thinking I might actually be cooking something good.Coding the koi as they are wandering on the screen... Awesome right?Eventually, my girlfriend and I broke up. No hard feelings. I saw her again a few months later, and she told me she was still using the game from time to time. It made me genuinely happy that she didn’t tie sad feelings to it, and that it still brought her a bit of comfort. Afterwards I kept thinking: if she was still using it, and my other friend kept it running to this day… maybe I was sleeping on something that could bring joy to a wider audience. So I started refining it, ported it from Mac to Windows, and set up the Steam page to gather feedback while I continue developing the full game.I haven’t fully figured out what the progression system should look like. A big part of the charm, to me, is the zen vibe — no XP bars, no notifications, just wandering, calming koi. But I also want to meet pla...Read full article on Community Announcements (aureliendsantos)
