I like the ambience you set for the soundtrack, sells that alone in an empty world vibe. However, like others have pointed out, the tracks do get a little samey and I wish there was a little more variety.

Great soundtrack ! Love that leitmotiv, could use a little more variation, but it's already great ! The ambiance is on top, really immersive, we feel the coldness and the spatial environment in those tracks especially with the reverb, the piano, the overall slow tempo of the musics, the synths... 

My favourite is Awaken, you handled well the parts of this one, the piano is beautiful, it plays the leitmotiv, but sometimes it stops right before, then it plays in a longer version and you add more layers to it throughout the music. The ambiance is great !

This is a really nice track, and the piano sections are really nice. I like the guitar part at the very end, although I feel like it needs a bit more bite, personally it's too dark for me with that intensity. Overall great job!

Each song grows gradually with more complexity and I like that. Usually I'm not one for these slower, more atmospheric entries, but I do enjoy the ends of songs when the buildup leads to some really nice sections.

Ashes of time and I forgot the world had my favorite sections at their respective ends with all the instruments. I also like how the final song calls back to earlier songs as a good sendoff.

Halfway through the final track when the strings came in was also really good as it gave the song more speed which I thought was something the OST needed dearly to give it more variety. I think more speed somewhere else in the OST would have been good though to really make it feel more complete. When all the songs have the same structure of buildup, it makes it feel less like an OST and more like a bunch of takes on the same idea. 

The tracks were still good and varied enough, but their overall structure felt a tad too similar, at least to me in the context of trying to make a full OST.

I really like your storytelling through music as well as the atmosphere you've created with your soundtrack, however the nearly exact same melody and the same chord progression throughout all the tracks gets repetitive very quickly especially since your tracks are quite long (even if its meant as a sort of leitmotif). The last track i think would also benefit greatly from a different drum sound (a more fuller one) - it sticks out a bit when the rest of your sounds fit so well together.