Pathogenic Demo

81KS
Released Oct 31, 2025by Aberrant LabsOverwhelmingly Positive(97% of 738 Steam reviews)

You are a disease. Infect the human body as a lone pathogen in this cellular roguelike shooter. Collect organelles to evolve your parasite in a microscopic arms race against your host's immune system. Conquer a beautiful, procedurally generated world of tiny proportions.

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About Pathogenic Demo

CELLULAR COMBAT EVOLVED

In Pathogenic, you are the disease. Experience a visceral 2D roguelike twin-stick shooter where you play as a lone parasite fighting a desperate war against the immune system. Your goal is simple: infect and completely conquer your human host.

To survive, you must adapt. Hunt down enemy cells, rip out their organelles, and graft them onto your own body. Evolve from a simple cell into a complex engine of destruction, creating powerful, game-breaking builds to become the ultimate pathogen.

CREATE YOUR OWN PATHOGEN

Loot, graft, and assemble your parasite from dozens of unique organelles. Combine lashes for movement, mitochondria for power, secretors for ranged attacks, and spikes for melee combat. Chain organelle effects and discover powerful synergies to build an unstoppable disease.

FIGHT THE IMMUNE SYSTEM

Battle a diverse roster of enemies, from basic immune cells like macrophages and T-cells to rival parasites such as tapeworms or protozoa. Formidable bosses are lurking deep within the host's organs.

METAPROGRESSION

Collect plasmid fragments to permanently upgrade your parasite's plasmid tree between runs. Each parasite will have it's own upgrade tree allowing for a range of builds to suit your preferred playstyle.

EXPLORE A MICROSCOPIC WORLD

Navigate the human body, a procedurally generated world of organic wonder. Travel through distinct biomes like the branching pathways of the lungs, the pulsating chambers of the heart, and the complex neural network of the brain.

FEEL THE ORGANIC ACTION

Our detailed, colorful world is powered by a soft-body physics simulation, giving every cell, enemy, and projectile a uniquely satisfying organic feel. The combination of hand-crafted design and procedural generation ensures that no two runs are ever the same, offering endless, challenging gameplay that always stays fresh.

Experiment with 4 different starting parasites and over 100 types of organelles and mutations to fight your way through the 4 floors of the demo. More levels, parasites and organelles will be coming to the full game! And plasmids collected in the demo can be transferred to the full game!

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Game details

Pathogenic Demo reviews

97% positive reviews all-time.

System requirements

Minimum

Minimum:
  • Requires a 64-bit processor and operating system
  • Graphics: GTX 1050

Recommended

Recommended:
  • Requires a 64-bit processor and operating system