This game is 100% AI Engineered

Hello everyone! One month ago, I decided to put my AI coding skills to the challenge and take upon one of the most difficult genre to code: automation games like Factorio.

That's how Zombies Per Minute was born! It is a factory-building roguelite where everything you build is measured by one thing: how many zombies you can kill per minute. Yes, really.

As of now, I spent around one month on it (somwhere around 150 hours I would say).

I used only 2 AI Agents:

- GPT-5.3-Codex for 80% of the task, mostly logics, simulation, render, performance

- Opus 4.6 in Claude Code for frontend and UI (I think it has more taste than Codex)

For sound and music, I went with ElevenLabs.

For 3D, everything is made programmatically with primitives, except the character (mixamo for now) and the zombies from Quaternius).

Regarding the tech stack, I went with Vite + React + TypeScript (I found the LLM so good with TS), and the library is ThreeJS, more precisely React Three Fiber.

It's been SO HARD to optimize for performance, as it is a web game and there can be 10000s of entities! and I'm packaging it with Electron for Steam as well.

You can try the game 100% free here https://www.zombiesperminute.com

(any feedback is welcome as I would like to polish the experience as much as possible, thank you so much!)

There is also a X thread when you can see all steps of development https://x.com/NicolasZu/status/2028021321280442737?s=20

I would be happy to answer any of your questions!