The battle system is pretty nice so far, and I really dig some of these tracks. The linearity I'm a bit annoyed about, but I'm still early in the game.
Vanile's weapon is... uh, odd. I think her character is more mysterious than it seems: I mean, she got her weapon by...yeah. Also
Spoiler Below Her "mark" is on an area that could have been hidden easily earlier, before everyone got "marked". Just an observation.