Well, I've listened to the album, and I'm gonna give my review now.
Bridge to the Sky: It's a good SONG, but a bad INTERLUDE. I mean I like how it's all techon-y and yet very "everlasting dream", but something about this song doesn't flow well to NEXT LEVEL.
7/10
NEXT LEVEL: IMO, one of her best title tracks. It's really very laid-back and relaxed, and you can really forget about your worries while listening to it. I'm really surprised to know it's a D.A.I composition!
8.5/10
Disco-munication: I don't really like this interlude, despite the cool name. It, however, is a good interlude, cos it really flows well to EnergizE. But yeah it just sounds so messy!
5/10
EnergizE: I really like this one! It's sugar-pop ala HONEY and ANGEL'S SONG... but in a edgier tone! There are a lot of electronica and rock influences in this song, but her voice still sounds really cute and sweet! It's a song that will get me flailing around!
7.5/10
Sparkle: Easily one of the better tracks in this album. I'm not Japanese, so I can't comment much on the "shallow" lyrics, but I really like the song as a song.
9/10
rollin': LOL @ intro. It sounds like a more serious EnergizE if you ask me. Honestly, I think they're really almost the same song. XD But having said that, I like both EnergizE and rollin' a lot, but they are songs that are very... how do we say it? A lot of people will love them, and a lot of people will dislike them as well. I'm one of those who love them.

7.5/10
GREEN: Hmm. GREEN is a very fresh and good song, but it feels SO out of place here! I agree with what some other users have said... it's gonna be more fitting if it's after NEXT LEVEL. At least glitter feels fitting in GUILTY lol... oh well.
8/10
Load of the SHUGYO: Once again, this interlude is actually working. I'm liking the rock here... it sounds very exciting! Like a video game!
7/10
identity: OMG I LIKE THIS ONE. It continues the thrill from Load of the SHUGYO and identity is just VERY COOL. I can hear influences from decision, but this sounds more edgy and 'cool'. The chorus... I can hear it in a Super Sentai show!!! It's like so cool... you know. I mean omg I like this one. A LOT.
8.5/10
Rule: I liked this at first, but now, it gets kind of boring... and stale. The bridge is awesome though.
7/10
LOVE 'n' HATE: OMG. I LOVE THIS SONG!!! It screams attitude, and I love the beats and all that... and the chorus = <3 It's very cool, just like identity, and to a certain extent, Rule. These 3 rock songs in NEXT LEVEL are like a different kind of rock... the 'cool' rock, not the rock you hear in GUILTY. It's very different and refreshing!
8.5/10
Pieces of SEVEN: IMO, this is the best interlude in NEXT LEVEL. I'm not sure if this an outro to LOVE 'n' HATE or an intro to Days. I'm thinking of the former. LOL. I mean it sounds very good and cool... but the transition to rock in the middle is like so misfitting for Days! So I think this is a good outro to LOVE 'n' HATE!
8/10
Days: Enough said. Best song in this album; my favorite song from her. This is a song that can make people (at least me) cry, and the emotions in her voice in this song and Curtain call is enough to make up for all the lack of emotions in the rest of the album.
10/10
Curtain call: Simple. Sweet. Touching. I cried several times while listening to this song... it's very good IMO. And her voice is just so touching... T_T
9/10
Overall: 7.5/10
To me, the best songs in this album are the rock and ballad section. GREEN feels SO out of place... and oh from Disco-munication to rollin'... I'm hearing Pokemon all over... it's like the instrumentals can just be put into a Pokemon game or something!