I love it, you've got some fantastic ideas. I loved where you moved to the thick chords, it mesmerizing. One thing I liked especially was your miserere, it's quite interesting. There are a couple things I'm not sure about.
My first thing is that you have the sopranos singing high Fs, Gs, and As softly. This is pretty risky, firstly not a lot of sopranos like doing that, secondly musical directors like it even less when their sopranos have to that (in a piece like yours where everyone has an important part of the chord).
When it's just the sopranos and altos, I find it less interesting, like on m. 35 and 36.
That miserere feels like it could be better, but I'm not entirely sure if I should give my personal insight on that, because it might just be a me thing.
m.28-30, I don't think that Bass 1 part is necessary, I think it'd be better in the tenor part. Especially with how important that Bass 2 part is in that series of chords.
Also for your cadences at the ends of phrases, you don't need to put a fermata over each chord, I know you might be doing it for playback but ti doesn't hurt to mention. Putting a rall. says the same thing.
I think this is a nice sounding piece, with some great parts, and couple parts that need that flat iron finish.