First and foremost, this is a very compelling story! I wish each track had an explanation of what was occurring in that moment, but I can use my imagination thanks to your thorough explanation.
Alternate Past: whatever soundmass you've created here, it couldn't have been at the click of a button (and if it was, I am dying to know what sound library it is!). I want to live in this ethereal soundmass. I want to buy a house in it and go stay there when I'm feeling pensive. Really cool-- and the slow sounds of a clock create this sense of something coming...
Forsaken Ruins: beautiful interplay of the cello and synth here. This track has more motion, and an undeniable icyness. I like it, and I want to hear what comes next after listening to it.
Metadimensional Rift: with a name like this, expectations are very high for this track! Fortunately, it did not disappoint! The bright, almost hopeful melody that is consumed by this dark, swirling noise paints a vivid picture of something horrible opening up.
Stream of Impermanence: another cool track that feels right out of an action sequence in a movie! The funky synths almost feel out of place here, but that's nitpicky (which I feel at liberty to do since this soundtrack is thus far very impressive.)
Hourglass Shrine: Not much new to say here! Sometimes it does feel like the piano is out of place with the rest of the mix: the distant synths are utterly cavernous, but the piano sounds right up close. Perhaps adding more wet to the piano could help? Either way, another stellar track.
Palace of the Demiurge: you know it's over when you hear the church bell... love the drama of this opening!
In all, this soundtrack aces the slow, atmospheric sound. I loved it-- good work, and keep writing!