Some things to note:
A couple textures in the game are from freepbr.com and don't allow commercial use. Look at Gnome-Space-Program/Assets/Textures/000_TEXTURE_CREDIT.txt
I intend to remove these textures and replace them with my own before releasing this game commercially
Contribution info is in CONTRIBUTING.md
Gnome Space Program currently uses Godot 4.5.1, with Large World Coordinates (see BuildingGodotEditor.md)