Hi ! Strange i just downloaded the file on the itch.io page, and i have all the music. Look inside the Vanilla Shake file, maybe you extracted everything here, it can happen if you manually selected the files and unrared them as it keeps the last song's name as the name for the entire album file extraction especially with WinRar, otherwise download it again and check if you have something like 68Mo. If you still have an issue, i'll send you the stuff, we'll find a way.
Keep me in touch, regards !