Rat Overflow

Rat breeding simulator with inherited traits and a growing colony

Little Beast Lab · Released Mar 12, 2026 · Early Access

Reviews: Very Positive; 85% of 71
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Untested
Last update on Steam: 5 months ago; May 23, 2026
Minimum PC: Integrated; 4 GB RAM · 0.5 GB disk; Full requirements

What is Rat Overflow?

Rat Overflow is a single-player, 2D simulation in Early Access. You select breeding pairs, raise pups, and enter rats in competitions, leveling up to unlock specialist breeders and new color varieties. You can also buy outfits and accessories for your rats.

For you if...

+you enjoy building animal bloodlines over multiple generations
+you like pastel pixel art and retro computer interfaces

Not for you if...

−you want varied activities beyond breeding and showing animals
−you prefer virtual pets that never get sick or die

What players say

85% of 71 reviews are positive

Players praise the accuracy of the genetics and inheritance systems. The most common objection is the use of AI-assisted code and text; players also criticize being unable to pause while managing their rats.

Screenshots and trailer

Rat Overflow system requirements

Minimum: Integrated, 4 GB RAM, 0.5 GB of disk space.

As published by the developer.

Can my PC run Rat Overflow?

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Minimum

OS: Windows 10
Processor: Any dual-core processor
Graphics: Integrated graphics
Memory: 4 GB RAM
Storage: 500 MB available space

Does Rat Overflow have co-op or multiplayer?

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

Single-player

Does Rat Overflow run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Steam features: Family Sharing
Languages: Text only: English.

Does Rat Overflow use AI-generated content?

Yes. The developers disclose AI-generated content on the game's Steam page:

AI used for text in-game and on the store page. All artwork in the game is fully handmade by me.

The statement mentions: Text & translationsStore page & marketing

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 27, 2026. How to filter AI games on Steam