I just hope a second series is done in the future, a la FMA. There's still so much that the show left out. If we do get a second show, I hope the creators adhere more to Ohkubo's style than they had previously. There's a lot of dark imagery that could have been adapted better. Though I love the Demon God's awakening scene in 23.
Also, even though I love Iwasaki's score, it doesn't always fit. Maybe it's just me, but I really think electronic music (like Radiohead's Amnesiac album) fits the tone of the series pretty well.