Hello @Alex Weidmann!
Nice mysterious Prelude! I'm surprised that @Henry Ng Tsz Kiu hasn't reviewed it yet since it's in his favorite key! 🤣
I have a few technical nit-picks: I've recently changed the way I write for piano through Musescore Studio 4 which I think might benefit you to hear about. If you favor the Musesounds Piano as I now have come to prefer, then in order to have more control over balance between the most important melody notes and less important background chords/figurations, you could actually load up two (or more) separate pianos and change the way they're displayed in the Layout section of the program (by deleting the bass clef portion of the right hand piano and deleting the treble clef portion of the left hand one). Then, not only will you be able to change the balance between the hands in the mixer, but you'll be able to give separate dynamics to each hand - an amount of control which you would lack with just one grand-staff track. Although you'd have to put in pedal marks for both tracks, and hide them in the top track. As well as hiding dynamics that are redundant. But I think bringing out the most important notes in each chord and passage will greatly improve at least my impression of the work.
Another thing is the tempo. I noticed that you're trying to create a sense of novelty through the use of unusual rhythms and meters. I think it could be even more effective if you included an ebb and flow to the tempo by simulating a sort of constant rubato with choice accel.'s and rit.'s here and there. I can refer you to examples in my own catalog if you'd like, where such rubato gives a very satisfying result (at least in my opinion) and cases where the piece would suffer greatly from the mechanicality of the rendition if not for the rubato. Some places to consider including an accel. and rit.: bar 30 accel. into 31 I think would be a nice paired with that crescendo you already have.
Other than that, nice job! I also question the interruption of the expected 4/4 flow of the beginning melody with the 9/8 measure - I think that's unnecessary. Thanks for sharing!