Your song, my review.
0:00-3:50ish, neat pads/sound scapes, samples used. I feel as if the clips of (unsure what it is) clicking/scraping could have been cut up and separated panning wise. Parts sounded smooth, others bit rougher, sounded like some granular editing/bit map editing took place. If so, kudos for delving into it. If not, well it sounds like it. I was fond of the hints of bird-eque nature sounds throughout. I found myself thinking a very sharp plucking ound could hit at an ymoment with a long trailing reverb, and fit in perfectly. I wasn' given that plenitude.
3:50 transition feels more like the swap over from one song to another then that of a coherent blend. One section fades out while the other fades in, and it isn't the smoothest of swap up. I think simply entertwiing the patterns more so and twining the fade in/out of the instruments to be a bit slower/individual from one another would make up for it.
One of your synths post 3:50 has a gritty edge to it, it sounds like a square wavey sound. Unsure if I like it, the high pitched arp has a bit of a tinny edge too.
4:30 roughly reminded me of Secede.
5:35 might be my headphones, but low ends are hardly present. The soft change in synth filters and compositional movements are nice. I feel things could sound fuller, but I'm kind of a turd-meister for always trying to buff things up in that reguard. Minimalisms not really a strenght of mine. :P I do feel however the arpping nature and continued playstyle alot of the instruments drone on a fair bit, that something that was more sporatic could give for a pleasant contrast that wasn't chosen by you.
7:05 your arpping main lead has a note that cuts like 1/16th of a note off. Its a bit of a hitch.
7:53 once more the transition from driving arps to sustained note feels a little too unbuilt up to for my liking. The following airy sounds after though work, its a smoother transition from held note to wind, then that of arps to sustained note. I don't know what to suggest other then simply a more layered approach to the transition. Say having a clone of the instrument playing a droned note slowly fade in, while the arps fade out, so it isn't purely a playstyle change, but one of volume/reverb drness or something else as well.
9:30 sounds like PWM / binaural beat modding, or intentional destructive harmonics. Its neat. I feel as if production wise the distorted shifting sound could be much more engaging if it had its higher frequencies reverberating or delayed so to fill up the high end a bit more.
10:40 bit crusher movement is evident, and has some clicking. It sounds like the steps of the automation can be heard, and the clicking sounds like the plugin doesn't support the automation. It sounds good admittedly, but it similarly to me sounds like some mistakes
11mins ish, I like the eerie ambiance an awful lot.
11:45 drop off is really nice a change from the elevating sound. I felt pacing wise there could be a bit of a gap after that of near silence before the introduction of the next section. This transition while I don't fully agree with the pacing/timing (given the last sentance), does maneuver much more smoothly.
13:40 there is a detuned sounding siren. Very nice. Alot of the sounds used throughout are very muffled, reverbated, obcured in some way. Long sustained, long to drone out. I really wish there were more sharp sounds that were in a psycho acoustical foreground, it would make the peice far more captivating I think.
15:38 vocal synthy blip is almost one of those sharper sounds I was hoping for.
Song ending as an individual piece is kind of weak, but given its ambient, they tend to be dependent on what follows after.
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Work on transitions more. I know working on a long peice can often become cumbersome given the sheer girth, and to listen to and evaulate your own work becomes awfully difficult, but it is absolutely necessary. Not all transitions in this song were equally strong as they could have been, and I think for fulfilling a strong ambient peice, there needs to be a high level of attention focused on cohesion.