Opening track, Awakening, set the mood really well, not only for a literal awakening, but also awakening to the gravity of a given situation, which you communicated very well here. I do love how dreamy it gets towards the end.
Countercurrent is an evocative ambience. The intro just sets the stage for what you're doing here. The guitar slides are nice.
Spiral Descent starts off more generic to me than what you've conveyed in the text, the image of a rotating tunnel where night meets day. When the synths build up more, it feels more like what you've written, but it does take some time to grow into that image for me.
Convergence, ah, I am hearing melodic fragments from previous tracks and they tie together very nicely here. The rhythmic synth with which you begin this track sets the mood pretty well, this is a make-or-break event. I would have appreciated more of a climax given that this is a final battle track; this feels a touch calm for the gravity of the situation.
Overall a cohesive soundtrack, an enjoyable listen, and without the context of game OST or scene writing, it is the kind of sound that I could get lost in for hours. Well done, and all the best!