Oh, and one more thing, not critical but still - you have some leftover psd's in sprite folders of Momoka and Saya.
And some very strange album arts in bgm :-D
Thanks for pointing it out, I'll upload a new build with the psd files removed.
As for the supposed album art issue, I can't see any art associated with any of the music files on my end, and no images are present in the bgm folder. Can you email me about this (my email is ebihimes@gmail.com) and send me a screenshot of what it is you're seeing?