// ABYSSAL LAB TETHYS — CONTAINMENT BREACHED

PROTOCELL

Mutation is Evolution.

A top-down arena survivor where power and instability are two faces of the same cell. Pilot an escaped lab organism, mutate to survive the swarm — but every upgrade pushes you toward meltdown.

Arena Survivor Roguelite Solo Full Controller Early Access
▼ DESCEND ▼

The Tethys Incident

A single cell, alive for millions of years

Deep beneath the Mariana Trench, a research lab pulled something from the dark. It learned. It adapted. It broke free.

Mariana TrenchMARIANA TRENCH · −11,034 M

The Signal

An automatic probe falls silent above the Mariana seafloor — it detected a biological signature where life is impossible. The scientists dispatch a submersible.

Tethys LabD+001 · TETHYS

The Protocell

Eight thousand meters down, in quarantine, the cell refuses to die. Acid: it thickens. Heat: it crystallizes. Asphyxia: it breathes something else. They name it — the Protocell.

MutationsD+089

The Mutations

Three months of stimuli. With every experiment its genome rewrites itself — proteins mutate, organelles change shape. The more it evolves, the more its stability declines.

It learnsD+200

It Studies Them

It no longer reacts to the tests — it anticipates them. Between each stimulus it reorganizes its genome, optimizes, learns. The scientists realize too late: they no longer study it. It studies them.

The breachD+347 · 03:47

The Breach

Containment fails. The Protocell dives into the abyss, where the leaked genome has already mutated everything. To evolve, it must assimilate every cell it destroys. But too many mutations destroy their bearer — instability is the price of evolution.


How it plays

Pure arcade survival — and a risk

Pilot your cell and dodge the swarm. Your weapons fire automatically at the nearest threat — no aiming, no reloading. Just movement, positioning and split-second decisions as enemies pour in from every side.

Move & Dodge

You control only your cell. Weave through projectiles and packs while your arsenal fires on its own toward the closest enemy.

Mutate on Level-Up

Every level offers a choice of mutation cards. Stack projectiles, auras, drones, shields, regen — sculpt a build from the swarm.

Manage Instability

Power raises your INSTABILITY. Cross the threshold and you trigger a meltdown: a 20-second countdown to a fatal explosion.

STABLEPOWER ▲MELTDOWN ☢

How far will you push before it all comes apart?


Content

A swarm of systems

8
Worlds
8
Unique Bosses
100+
Enemies
52
Mutations
18
Evolutions
41
Achievements

52 Mutations

Offensive, structural and special mutations drawn as cards. Bring two to their peak and they fuse into one of 18 Evolutions.

Instability & Meltdown

The signature mechanic. Trade survivability for power and ride the edge of catastrophic overload.

🜂

8 Worlds, 8 Bosses

Each world has its own bestiary, hazards and a rule-bending modifier, capped by a unique boss.

The Primordial Abyss

A separate descent mode: 10 layers, 10 unique procedural bosses, persistent progress between attempts.

The Lab

Create cells from raw DNA, cross-breed them across four ranks, grow them on a 41-node tree, equip organelles, craft genome recipes.

Procedural Creatures

Every cell and enemy is generated and animated in real time — your protocell breathes and shifts as it lives.

🎮

Full Controller

100% playable on gamepad — combat, menus, even text entry — with adaptive Xbox & PlayStation prompts. Or keyboard.

🏆

Steam Achievements & Cloud

41 achievements including a Platinum, plus Steam Cloud saves to carry your colony across PCs.

🌐

English & French

Fully playable in both languages, interface and text. Built on a moddable string system.


The Descent

Eight worlds to escape

From the flooded corridors of Tethys to the heartbeat of something older than matter. Each world bends the rules; unlock them one by one as you grow stronger.


Modes

Four ways to evolve

The Arena

CAMPAIGN

The Arena

The core run. Pick a world, survive escalating waves, and face its boss at the climax — then beat the final world, "The Host", to unlock a true playable epilogue.

  • 5 difficulty levels + an Endless mode per world
  • Run-defining mutations & auto-fusing evolutions
  • A campaign with a real ending and post-credits stinger
The Primordial Abyss

ENDGAME

The Primordial Abyss

A dedicated descent: 10 layers down, each guarded by a unique procedural boss. Your best depth, discovered mutations and harvested DNA carry over between attempts. How deep can you go?

  • 10 layers / 100 floors, 10 one-of-a-kind bosses
  • Persistent rewards across attempts
  • Unlocks new mutations for your arsenal
The Lab

META

The Lab

Between runs, build your own cells. Create protocells from DNA, cross-breed them across four ranks to engineer stronger offspring, grow them on a 41-node DNA tree, equip star-rated organelles and craft genome recipes.

  • Creation & breeding — ranks Strain → Sequence → Chimera → Apex
  • Organelles with set bonuses, a respec-able growth tree
  • Genome synthesis: 20 recipes to unleash mid-run
The Symbiotic Bench

SYMBIOSIS

The Symbiotic Bench

Penetrate the ancestral Hosts: form a team of protocells, dive through ten levels of each Host, and hunt the organelles they drop to permanently strengthen your colony.

  • Several ancestral Hosts, ten levels deep each
  • Win star-rated organelles (typed by stat) as drops
  • The main source of organelles for your cells

Arsenal

Build a cell that shouldn't exist

All 52 mutations across offense, structure and utility — every one your protocell can grow:

…and bring two compatible mutations to their peak to trigger an Evolution with its own signature mechanic.



Early Access

Grown with the community

PROTOCELL is a solo project, already packed with content and fully playable start to finish. Early Access is about balancing and expanding it with player feedback before 1.0 — your reports shape what comes next.

  • NOW 8 worlds + bosses, the Primordial Abyss, the full Lab, a campaign ending, 41 achievements, EN/FR.
  • NEXT Balancing, polish, and more content — mutations, enemies and modes driven by feedback.
  • SOLO Code, design, art and procedural visuals hand-crafted by one developer.

The confinement is broken.

Wishlist PROTOCELL and be there when it surfaces.

◈ Wishlist on Steam