Hi hi! Glad to hear you enjoyed the game :)
Supply Chain was created as an intentionally small game to prompt thought on the dynamics of just-in-time supply chains. At the moment, I don't have any plans to expand the game.
The game's source code (which is entirely GDScript) is available on GitLab. If it's helpful, there's also an in-game event editor that can be accessed by pressing E when Debug Shortcuts are enabled.
Hope that helps, and best of luck with your own projects!