To be clear: this is a really awesome and impressive work. I have included a bunch of constructive notes in this since you seem keen for some 🙂
listening/reading notes:
Introductory page is extremely beautiful. Love the improvisatory nature, spacious without feeling empty
[Have to say I am not a huge fan of the F major melody on page 2, it feels a little straightforward to me]
Modulation in bar 26 is very nifty 🙂
Love the bass motif in the main F minor subject, very characteristic and memorable
Reappearance of the intro subject at 67 is great, everything up to the build and surprise Bb chord (fun trick) at 94 is awesome
[95-108 is a little meandering for my taste]
Modulations through 117-143 are very compelling and exciting
160-163: *chef's kiss* reminds me of some Rach climax harmonies here.
Arpeggios at 165-180 are a little extravagant for my taste
Fugue at 181-196 has a nice idea, you have a great subject, I just wish it had a little more time to breathe (4 voices enter on the subject without any development time between their entries). in this area bars 190-195 feel the most effective to me because they feel the most balanced; the voices here have rhythmic variety to distinguish themselves clearly and there's a little more negative space to guide the ear. I feel like the classic fugal structure of introduce voices 1 and 2 (maybe 3 if you're feeling brave), and then have some development time before introducing more voices, would work well here. It feels a little more like a gesture towards a fugue than a fugue (maybe it's a fughetta).
Recap is great 🙂 i do like this theme a lot. The crunchy move in bar 229 is great
263-290 feels like it could be trimmed. We've just heard this theme in the recap a few moments ago anyway, and the straightforward dotted rhythm is not the most exciting thing to zone in on for several more bars. It feels the movement on top of the tremolo is a bit slow. But the exit out into 291 is very beautiful.
I love the intro, so obviously I love the outro too 🙂 And to be fair, the F major theme from the start pays off pretty well in bars 317-318, great way to finish. (Maybe just something a bit briefer / less extravagant than page 2 would suit me.)
I really like this piece! I think there is possibly a 12-13 minute version that I *love*, but it is not my place to play editor haha