The developer has released source code for some versions, often available via Itch.io or GitHub.
You can mod Endoparasitic or its sequel by using GDRE.tools to recover the project files and the Godot editor (version 4.x is often recommended for newer entries) to build new scenes or scripts. File: Endoparasitic.zip ...
Save the remaining research data before the organism within completes its cycle. How to "Create a Piece" of the Game (Modding & Access) The developer has released source code for some