I really like the stage theme. It sounds very "Evillious" to me, especially in the part where you fight Ruri. It also sounds a lot like TLC's extra stage in some parts, but I think that might just be similar instruments I'm hearing. I don't like the boss theme at all but I'm hoping it'll be like the Extra boss theme; it'll get better the more I listen to it.
(My computer can't play the game at a decent speed, so I could only watch the video). As far as spells go, most of the early ones seem dumb to me, most of the later ones seem ridiculously hard, but I really like the middle ones =P. I also like the 8th spell, and the second phase of the last spell, even if they are insane. And btw, the second spell is just like a spell in
.
I'd like to point out that even if Ruri was
implied to be Yukari's shikigami, that doesn't mean she ever was. Red herrings and all. And IIRC, Yukari couldn't even remember if Ruri was her shikigami or not (and neither could Ruri, for that matter).