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The Last Leukocyte: Immune Protocol
Fight cancer as the last leukocyte in a survivors-like action roguelite. Build your loadout with manual and automatic weapons, perks, and items while surviving in a living ecosystem that reacts to your presence and feeds on the remains of the dead.

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Features
Single-player
Family Sharing
Profile Features Limited 
Languages:
Interface Full Audio Subtitles
English ✔

Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“I still remember the day I first watched my dad play a video game when I was a child. The idea that someone could create an entire world limited only by imagination felt incredible to me, and ever since then, making games has been my dream.

My main inspirations are Vampire Survivors, Spore, and John Conway’s Game of Life. The Last Leukocyte: Immune Protocol is my first game, and I want to develop it in an honest and thoughtful way together with the community. Early Access gives me the chance to improve the game based on real player feedback, while continuing to add new content, fix issues, and refine the overall experience.

I do not want to promise perfection from day one. I would rather build a strong foundation and keep improving the game step by step with the help of the people who play it.”

Approximately how long will this game be in Early Access?

“I expect The Last Leukocyte: Immune Protocol to remain in Early Access for around 6 to 12 months. This may change depending on the pace of development, the amount of feedback, and how much polishing the game needs before full release. ”

How is the full version planned to differ from the Early Access version?

“The full version is planned to include:

- 7 stages, each with its own boss
- more items
- more weapons
- more playable character options or starting variants
- improved balance
- bug fixes and overall polish

I also want to take community feedback seriously and use it to help shape the direction of development.”

What is the current state of the Early Access version?

“The current Early Access version includes:

- 4 characters
- 3 stages
- 20+ different enemies, each fulfilling its own role in the ecosystem
- 15+ perks
- 25+ weapons
- 30+ items”

Will the game be priced differently during and after Early Access?

“The price is planned to increase after Early Access, alongside major content updates. I want the price to reflect the amount of content and the overall quality of the game as it grows.”

How are you planning on involving the Community in your development process?

“Community feedback will be a very important part of the development process. I plan to listen closely to player opinions, suggestions, and balance feedback, and use that input to help guide future updates. In the future, please leave all feedback on the Steam forums.

I want The Last Leukocyte to feel like a game shaped not only by my own vision, but also by the community supporting it from the very beginning.”
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About This Game

You are the last leukocyte.

Stand against cancer as the final line of defense in a survivors-like action game set inside a living, hostile ecosystem.

You are not fighting through scripted waves or fixed timers. The world reacts to your presence as an unwanted intruder, and survival depends on how you move, fight, and disrupt the balance around you.

A world that reacts to your actions.

The ecosystem does not exist just as a backdrop — it responds to what you do.

Absorb the remains of fallen enemies to grow stronger, but be careful: you are not the only organism feeding on the dead. The same resources that fuel your build can also strengthen other creatures, forcing you to choose between pushing forward, securing resources, or preventing the ecosystem from becoming even more dangerous.

Build around weapons, items, and synergies.

Fight cancer with a mix of manual and automatic firepower.

Use 2 manual weapons that you control directly and 2 automatic weapons that support your build in different ways. Some automatic weapons fire constantly, while others activate during reload windows, turning timing, weapon management, and positioning into core parts of combat.

Unlock perks, collect items, and create powerful synergies. In The Last Leukocyte: Immune Protocol, every mechanic is meant to matter.

Adapt to a living battlefield.

Face a growing biological threat and shape your build against an ecosystem full of enemies with different roles and behaviors.

  • 20+ different enemies, each fulfilling its own role

  • 15+ perks

  • 25+ weapons

  • 30+ items

    Survive escalating encounters, grow stronger during each run, and push back against an ecosystem that evolves in response to your actions.

AI Generated Content Disclosure

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

Generative AI tools were used as development assistance for portions of the source code, including drafting, organization, and commenting. No live AI-generated content is produced during gameplay.

System Requirements

    Minimum:
    • OS: TBA
    • Processor: TBA
    • Memory: TBA MB RAM
    • Graphics: TBA
    • Sound Card: TBA
    Recommended:
    • OS: TBA
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