Window Aquarista (2026)

Developer: LunarianDev
Platforms: Windows
Genres: Casual, Simulation
Rating: 5.0 of 5, 11 player ratings
Typical playtime: about 5.4 hours
Where to get it: Steam

The 3D catalog: game boxes on wooden shelves, with the cat sitting at the counter next to its greeting.

The catalog in 3D

The same catalog has a room you can walk around in. The cat behind the counter is the AI Catbot, and they pick real games from it when you tell them what you feel like playing. Nothing is for sale, here or in there. Go in from here and this game is already out on the counter, with more like it waiting on the shelf next to it.

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How it feels

A gentle, low-effort aquarium simulator that sits quietly at the bottom of your screen, letting you build and maintain tanks while focusing on other tasks.

idlechillrelaxingcasualcozylow-intensitycalmnon-intrusive

What players say

Players enjoy this as a low-attention idle game that runs on a second monitor, ideal for background play while working or watching videos. The fishing minigame to unlock new species is a highlight, though some want more fish and taller decorations for the endgame.

Screenshots

More games like this

This page is from Underplayed Gems, a catalog of older and overlooked games. Not quite it? You can browse by platform and genre, or take this one into the 3D catalog and ask the Catbot for something closer.