I love this eerie intro, slowly layering extra instruments on top! It really feels like you've just entered the wrong place. And just when I figured that it might need a change, you changed it up; fine timing on that part. The following section is a great battle theme, with plenty of variations and interesting effects (e.g. 1:45, 1:56) to keep me interested. The song fits the evil "darkness" theme of Yuwall just right. I love the use of a 6/8 (or 12/8?) time signature.
The first and second phase are very distinct (intro and battle), but I have a bit of trouble identifying the third phase. I figured it started at 3:00, but the song seems to go back to the same theme as in phase 2, so it feels more like an extension of phase 2.
Overall, really cool! There are a lot of things here I could see myself trying in the future :D
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I really appreciate your comment. It was my first music game jam, and I tried to be more accurate with the theme. Unfortunately, I didn't have a lot of time to make it more spacious because I work a lot. However, I'm happy with the result. You're right about the description: the intro presents Yuval, and next, the loop track develops for three boss phases. The third phase was more conclusive and tense because Yuval is closer to death. The time signature is 12/8. Thanks for the comment!