EvoFactory

A real-time cell biology simulation game built with Godot 4 and Rust (GDExtension). You control a living cell navigating an infinite procedurally generated world, absorbing resources, building organelles, and evolving through a tech tree.

Gameplay

You play as a single cell trying to survive and grow. The game alternates between two views:

• World view — navigate your cell through a dimetric-projected infinite world to find glucose, amino acids, and nucleotides
• Interior view (TAB) — manage organelles inside your cell: place zymases, motors, and mRNA strands

Core systems

• Resource absorption — glucose, amino acids, and nucleotides are absorbed on contact and enter the cell interior as particles
• Crafting — zymases convert glucose into ATP; mRNA strands consume amino acids to produce new organelles (motors, zymases, membrane growth)
• Gene regulation (G) — set conditional rules that automatically suppress or enable mRNA production based on organelle counts, density, or surface density
• Tech tree (T) — unlock capabilities like chemoreceptors and a programmable nucleus by meeting biological milestones
• Autonomous movement (A) — toggle AI-driven chemotaxis (gradient-following) or Brownian random walk; requires the Chemoreceptor tech for sensor-based navigation

Controls

Key	Action
Arrow keys / WASD	Move cell
TAB	Toggle interior view
G	Gene regulation panel
T	Tech tree panel
A	Autonomy panel
R	Restart (when dead)

Building

Requires Godot 4.6+ and Rust nightly.

cd rust
cargo build

Then open the project in Godot and run.

Architecture

• rust/src/simulation.rs — core simulation state and tick loop
• rust/src/autonomy.rs — chemotaxis and random walk logic
• rust/src/crafting.rs — organelle crafting and mRNA processing
• rust/src/interior.rs — particle physics, absorption, diffusion
• rust/src/rules.rs — gene regulation rule evaluation
• rust/src/tech.rs — tech tree progression
• scripts/ — Godot GDScript for rendering, input, and UI panels

Testing

cd rust
cargo test