Planned Release Date: November 2026

About This Game

What you feed is your build.

MUTARIUM is a feed-and-defend roguelite. You run a lab aquarium full of specimens that mutate based on what you feed them — and the lab's failed experiments keep breaking in to eat everything you've grown.

You never command your fish. You feed them, they fight. Every pellet is a build decision.

• Three feeds, one build — MEAT makes killers, GLOW makes earners, ORE makes walls. The mix decides each fish's mutation branch: pure lines, hybrids, and a KING rank for those who push their luck.
  
• Read the forecast, change the diet — every wave is announced before it hits. Chargers punish your shots, spitters hit from outside your tank line, splitters punish your finishers. Your counter-pick is what you feed next.
  
• Overfeeding is real — max out a specimen and keep stuffing it, and it goes berserk. Your best fish becomes the invader. You made it; now deal with it.
  
• Bosses drop sealed specimen eggs — hatch them to unlock new species (Guppy, Leech, Ironjaw, and one still sealed), each with its own mutation tree and a codex to fill.
  
• Short runs, long descent — a run is one dive through the facility: the Isolation Tank, the Deep Vats… and four sealed floors below. The elevator keeps going down.

Heads-up on tone: mutation is cartoon body horror. Specimens visibly deform and grow clustered eyes as they advance. No gore, no realistic injury.

Insaniquarium invented the feed-and-defend aquarium in 2001, and nothing has carried it forward since. MUTARIUM is a love letter to that genre — rebuilt as a roguelite, where the feeding itself is the build.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Generative AI was used to create visual art in this game. Creature, character and background artwork was produced with AI image and animation tools, then hand-edited, cleaned up and assembled by the developer before being placed in the game. This artwork also appears in store page and marketing materials. The game additionally uses licensed, human-made pixel-art asset packs. AI tools (LLM) were also used to help write the game's code and in-game text during development, and to translate that text into the game's six non-English languages (Korean, Simplified Chinese, Japanese, Russian, Spanish, Brazilian Portuguese). All audio - music and sound effects - is human-made and licensed from human creators; no generative AI was used for audio. No AI runs during gameplay: all content is generated ahead of time and reviewed by the developer before it ships.