Thanks for playing! That's amusing, for some reason I never tried that while building it :)
Thanks for the support over there! For the icons I'm basically just using subviewports to create a 3D scene and then extracting a 2D texture from there to display in the 2D UI. This doc has more information: https://docs.godotengine.org/en/stable/tutorials/rendering/viewports.html#introd...