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So, first I think I need to mention that posting two rather large pieces in one post like this and not splitting them into movements in the audio is cumbersome and I don't think many people will take the time to go through almost 40 minutes of music this way. Next time you want to post something over 10 minutes you should split it into parts, at least the audio, and maybe not post two long pieces in one thread, since one is already a lot of work to go through.
And second, I went through the first sonata only since I only have so much time right now.
On the first movement of the first sonata, I think there is just too much going on and I don't really see what is more important out of the various different themes you present one after the other. Like, you start with a pretty strong motive that goes on until measure 20, but then there's something totally different and by measure 41 you're introducing another motive you repeat, with a reprise of the first right following. Yet those 20 measures between 20 and 41 I don't feel have anything to do with either those themes.
I think this is a problem throughout the whole piece to be honest, there's a lot of "padding," in my opinion, that doesn't relate or have anything to do with anything. Another example is measure 95 and the whole bit with the ostinato figures. You're introducing brand new material mid-way through the movement and, even if you keep using it later, it's a lot already. Never mind it then follows into a dance-like bit in measure 112 that, again, has nothing to do with anything really except that it resolves into the second motive from measure 41.
As for the ending, I'm not sure if these movements are all attacca or what, but to me it felt that this first movement didn't really properly finish. I'm not saying you need a cadence, per se, but the first movement just suddenly ends.
The second movement is a little more consistent, but I still have a problem understanding what is more or less important. The beginning of it is more of an "effect", with the real melodies showing up in the "largo" at measure 179 (why not reset measures to 0 in each movement??), but then it's still a bunch of music that I don't see has anything strong enough that can stand out as any kind of unifying theme, so it again feels like filler. Sadly I found myself tuning out of the whole thing around this point since there's very little to focus on and instead it just feels like you're going on and on with new stuff you do once and then drop (like measures 189 to 194). In 207 you start somewhat developing the starting section and that's more interesting, but then again new material appears in measure 215, instead of developing what you already introduced in measure 179. It ends up being like a weird rondo of sorts.
The ending for this movement is a little better, there's a proper build up to the ending and I think it works fine. What's kind of strange is that instead of changing the character of the 3rd movement it the start of it feels like a coda of the 2nd. Which is why I'm asking if they're supposed to be played attacca.
Also, is the main theme the one that shows up in 261? Or is the one from earlier at the beginning? Not to keep hammering on the same point, but long forms live and die on prioritizing material. If it's just a barrage of nonstop new material then after a bit my brain just tunes out since I can't keep track of everything, or it feels like none of it really matters since you'll jump from thing to thing without any consequence or consistency. Just repeating some motives here and there isn't enough, there needs to be more proper development of established material, or it becomes a chore to hear (for me) since I have nothing to orient myself with. If it was just a series of short pieces that were like this, I think it wouldn't be such a problem, but because this is 25+ minutes of continuous music the problem is very much amplified.
And the 3rd movement's ending is also strange. You have a typical pause -> octave jump as the end, but the issue is that there is no build up to it, again, it feels like the whole thing just ends rather than going to the ending.
All in all, there's some interesting moments and some interesting harmonic choices, but making this "a sonata" seems like the wrong choice for a structure. I'd much rather have this split up into several short pieces where you can work out each individual moment in and focus your ideas than a huge 25+ minute piece that is unfocused and overly long without any real justification for its length.