I agree I would have loved to add more juice.
Terraforming system - started with https://github.com/alpapaydin/Godot4-3D-Smooth-Destructible-Terrain and modified.
I actually have some updates I want to commit back to that project because it was a great starting point with a few issues that were easy to solve (performance, shape, etc.) and some that I haven't solved yet (when you dig you can place a hole in a seam because the world is chunked, only hard to solve because you have to accommodate for performance and probably don't want to update both those meshes at once).
Thank you for playing and the feedback :)