Hey, I really want to use these models in MagicaVoxel, but when I drag the file in, nothing happens. I see on twitter that other people have gotten it to work. I can import it as an image fine, but that's just a flat image. I was able to import other .vox files made with different software just fine though. I think perhaps MagicaVoxel has changed the details of their file requirements since you made that export function.
It also could not import your .md or .svg files, on further investigation.