I downloaded the project and played around with it. It is probably one of the most awesome Godot plugins I have seen! The volumetric lighting looks great, and the performance was a lot better than I expected given the quality of the visuals it produces:

I also recorded a video showing it running in the editor. Unfortunately, OBS was causing issues when trying to run the project itself, so I just recorded the my desktop window and the Godot editor:
The video is unlisted, but I can make it public if you want. There were slight issues while the project was running due to OBS, but thankfully it appears the recording didn't catch many of them. I do not think the issue is due to the plugin, but rather something with OBS was causing the issue.
Honestly, I think the plugin rivals a lot of the volumetric I have seen in other game engines, and the ability to set custom volume shapes through 3D textures is really neat. I do not currently have a project that could benefit from the plugin right now, but I'm definitely going to keep the plugin (even in its current state) in mind for future projects :smile: