Thank you for the kind words! However, please note that this entry is built on another project. See my response to the jam host. Also, as mentioned, I released the source code.
You are right that all beatmap editors (official or otherwise) run on desktop, not VR. It would be cool if this project turned into a fully-fledged VR-based beatmap editor as discussed briefly on Discord. That will definitely be my roadmap if I can find time to develop this further.
The beatmap files also contain the light show (lights and spinning environment pieces). This jam version uses the light show from the beatmaps directly, but generating it automatically sounds doable.