My Ocean of Thoughts (Title Screen): Lush pads. Atmosphere well fitting of the theme.
Cognitive Caustics (Sunlit Zone): Love the I-bVI-Vmaj7 movement. Love where the bass comes in. Gives me Kirby vibes. Great synths! My favorite track!
Lost in the Mind's Abyss (Abyssal Zone): I honestly also originally had the idea of doing the sunlit zone/abyssal zone (I did still kind of use it though). Love to see you pull it off so well! Love the dark progression.
Ushio's Theme: Great piano and character theme to close off the OST.
This is one of my favorite entries. Great work!