There's nothing like building software for a new platform to discover bug!

Some lessons have been learned re resource loading in an exported Godot project, and some materials have been changed to support the webGL presentation.

Mostly the problem was using emission on materials, but shading and transparency don't seem to mix either. I had been using a single material for the checkpoints and toggling the material emission on/off to make them visually distinctive, this simply caused them to never light up and remain ghostly things.

I found an acceptable solution by disabling both emission and shading for the checkpoint materials, and swapping between two textures to enable/disable the "glow". It actually worked quite nicely; they now stand out (almost like they glow) with the lack of shading making them stand out.

My other main lesson is that DirAccess does not work for "res://" once a game is built. I had to put hard references in for the built-in color config choices before they would load. I had been relying on scanning the directory and loading all saved resources therein, which just isn't a choice.

Anyhow, we're past the first significant bugs and the webGL build seems very playable. Enjoy!