Good to see you here again :)
1) Oh, that classical "lovers progression" (I-V-vi-iii-IV-I-ii-V, or any approximation of it) is doing its magic, I know it must be! I love the vocals, really cool :D
2) I love that it starts out really calm - I often want to make over-the-top songs which sound nice, but often a bit of ambience can work wonders in games.
3) I feel like I heard a bit of 'Aria's theme' in here - that lovers progression, even when not played in full, is hard to miss. Nice leitmotif!
4) Love the chord progressions in this one!
5) Oh yes, a battle theme partly in 15/8, let's go! Very well executed too. I love me some odd time signatures. And I hear parts of the previous song, 'Sanctuary of Reason', in here as well, very nice.
6) Repeating that theme over and over with those "Crystal" songs is a good tactic for creating consistency and getting it stuck in our heads. Smart ;)
7) I love a 4/4 song that switches to 3/4! And it feels very "tranquil" indeed; very serene and calm.
8) This is starting to feel like we're reaching the end. Like it starts to get nastier from here... Nicely done.
9) Oof, a song that even I cannot follow. My instincts tell me that this is not a weird time signature but just a lot of weirdly off-rhythm notes. The background is simple enough for it not to overwhelm. Makes for a nicely complex battle :)
10) The final crystal song. Feels fitting that the vocals return. Makes for a satisfying ending :D
Your songs sound really good, all of them, and you know how to balance your complexity with your simplicity well. Very well done, you always manage to impress :D