PCGame

Under the blue horizon

Idle aquarium sim you can keep onscreen while working

Pavdup, Chyopa · Published by DEVDUP · Released Aug 9, 2024

CasualIndieSimulation

Reviews
Mostly Positive
79% of 182
Recent reviews
Not enough recent
Players
0
daily peak, Nov 7, 2026
Steam Deck
Playable
Last update on Steam
2 years ago
Oct 19, 2024
Minimum PC
4 GB RAM · 0.3 GB disk
Full requirements

What is Under the blue horizon?

This 2D idle simulation puts an aquarium in a movable window alongside your other tasks. Raise fish by feeding them shrimp, turn their byproducts into Aqua to expand the underwater space and place structures, and hire crawfish and jellyfish to help gather resources.

For you if...

  • +you like slow-paced aquarium building and raising fish
  • +you enjoy keeping a pixel-art game onscreen while working

Not for you if...

  • −you expect an idle game to need little input from the start
  • −you prefer fast progression to gradually unlocking new fish

What players say

79% of 182 reviews are positive

Players praise the pixel art, calming pace, and ability to keep the aquarium onscreen while doing other things. The most common complaints are having to create fish repeatedly before the game becomes hands-off and unclear explanations of its systems.

Screenshots and trailer

Under the blue horizon screenshot 1

Under the blue horizon system requirements

Minimum: 4 GB RAM, 0.3 GB of disk space.

As published by the developer.

Can my PC run Under the blue horizon?

The published requirements do not name a graphics card we can compare.

Set up my PC →

Minimum

OS
Windows 10
Processor
Intel® Core™ i3 @ 3.2 GHZ
Memory
4 GB RAM
Storage
300 MB available space
DirectX
Version 9.0

Recommended

Memory
8 GB RAM
Storage
300 MB available space
DirectX
Version 9.0
Notes
Recommend More than FHD Monitor

Does Under the blue horizon have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Does Under the blue horizon run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

  • Sometimes shows mouse, keyboard or non-Deck controller icons
  • Some in-game text is small and may be hard to read
  • All functionality is accessible with the default controller configuration
  • Default graphics settings perform well on Steam Deck

PC version details

DRM
None declared on Steam
Controller
Keyboard and mouse
Platforms
Windows, macOS
Achievements
21
Steam features
Cloud saves, Family Sharing
Languages
Full audio: English, French, Italian, German, Spanish - Spain, Japanese, Korean, Portuguese - Portugal, Simplified Chinese, Traditional Chinese.

Does Under the blue horizon use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 25, 2026. How to filter AI games on Steam

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