-m1-2 and 5-6: Playability is definitely still an issue in the R.H. in m1-2 and L.H. in m5-6, as it's pretty hard to play dyads at this speed. Maybe a good rule of thumb is that most players probably can play up to 2, maybe 3 dyads after each other quickly, but it very much depends on context and trying stuff out. I think something like this is a bit more doable:

I think you can copy this over to the L.H. in m5-6 too, but the L.H. is by default a bit harder to play, especially in beat 4 of m5: you might wanna remove the Fb there too
-m8 and 9: Is there a specific reason you didn't add the slur in these measures like in m4?
-m14: It seems a bit contradictory, but it's actually easier to play the R.H. F on beat 1.75 an octave down. The R.H. is in a great position from beat 1.5 to play the F there, and has to do a jump that's not necessarily easy, but still doable for an experienced pianist. Jumping from beat 1.5 to 1.75 is a bit uncomfortable though, and the repeated F on beat 2 doesn't make the connection to beat 2 easier.
-m18-19: Maybe you could emphasize the melody notes on every x'th or x.5th beat with an accent, or slurring the sixteenths to the x.25th or x.75th beat, or staccato-ing every x.25th or x.75th beat?
-m19: I hear a G in the L.H. on beat 3.75
-You actually have space to not need the D.S. al Coda, if you do 5 systems per page on page 3 and 4. I may actually suggest to write it out anyway, so you have some freedom to tone down on dynamics or octave doublings in the R.H., since the second time around the second voice disappears in m16 and the drums pull out in m17.
-m26-27: I think I'd suggest leaving out the top voice in beat 4 and in m27 the first 16th of beat 1 for playability.
-m30-35: More playability suggestions for the L.H.: The same thing about leaving out the top voice in beat 4 (in m30, 31, 34 and 35), and I think any repeated bass note (like beat 3.75 in m30 or beats 1.75, 2.75 and 3.75 in m31) will require too much focus from the pianist, despite it being a delay-effect note.
-m37: Maybe you could move the grace notes + beat 4 dyad to the L.H., so the R.H. can keep on trilling for a little bit longer?