hmm....
whether you used overused sytrus presets a not they set the mood quite well and go along with the imagery. the choice of arpeggios on the bells were put together quite nicely and the overall composition and instrumentation is quite relaxing and floaty (but a bit dragged out and boring)
My first beef would have to be when you broke the rhythm on the bells from the eighth notes suddenly into half notes, making it feel awkward as a transition. I would let the bells play for a bit longer, made making the melodic patterns ascend and slowly stop as you get the highest note of your arpeggios...or just keep the bells playing there parts and bring in the other set of bells and strings...that would make the intro a lot smoother.
but the sounds are real nice right now, nice and smooth. Great job with the atmosphere, real fluent progression and the feedback ambience lower and higher strings really do their job.
The melody on the tibetan bells was real nice, and the slow decaying synth that highlighted the notes backed it real nicely. 2:00 was a bit too long IMO for the melodic theme to come in it, and it didnt last long nor came back (I'll explain this more in depth later)
the transition on the bells felt a bit more flowing because the strings were still playing. The next chords don't feel like they're going anywhere with me. For one, there is not enough bass in the individual arpeggios, you could still keep the patterns the same I'd say but atleast put a lower note on the same synth at the start of every bar or whatever.
I did like how you speeded up the bells at the end, but it really felt out of place considering the over-minimal rhythmic scheme you had played throughout the previous few minutes. The chord progression at the time didn't sound very original or give off that nice vibe like your progressions did for me.
Atmospheres built and harmonized rather nicely in the end, good conclusion.
there is a lot of repetition in here and little variation- not really melodic wise is were it strikes as a problem, but you kept the same overall basic rhythm themes throughout and there is no percussion or lead melody to keep this department interesting. Really just experiment with different rhythms more, the bells were consecutive eighths throughout, and all the strings and other ambient textures were long, extended notes mostly throughout. Try chopping up some of the long notes up, divide them into two, maybe a chop up a whole note into a half and two quarters, still simple but it would keep things more interesting and add some intricacy, which this piece lacks (but not necessarily needs). which brings me to my next point about the melody.
there wasnt really a lead voicing in this entire track at all. just the short tibetan bells part which happened in the interlude section, and at that, they felt most like an introduction to a main melody theme rather then the theme its self with the sustained notes. (if you need a melody, the fading, glassy synth used in the second phrase might just work great for this piece, just give it a more intricate rhythm theme) although having a lead melody in ambient doesnt seem always like a necessity- but in this case you definetly need to change up the bells more since they kind of fill the void in the lead spot.
Also second part, 2:56ish to the end the bass completely dissapeared (I could say no pun intended if nemo was a bass fish, ha). An atmosphere, especially one that reflects the deep encompassing sea, IMO should definetly have big, bassy and warm texture to thicken out the sound.
so a good audio right here man, goes along with the aquatic ideas well, it just needs some more development and of course- some more original sounds. I recommend looking at tutorials on synthesis and start tweaking the sytrus presets and developing synths in 3xosc. definetly some more filtering, panning, variating reverb and different FX would make this a GREAT ambient piece.