Sorry for the wait! Great pick, one of my favorites from Color Splash.
-m4/52 LH: I'm hearing the two bass notes an octave lower than you have them.
-m5-m12 LH: I really like the idea of including the chords on the offbeats, but it seems like a shame to only do it for the first few measures. How would you feel about raising the bass an octave in m7-8 etc. and adding some more offbeat chords there? To me it sounds a bit empty without them. Here's what that could look like:
I inverted the chords in m7/8/11 so that they would be easier to reach, and put the beat 1 bass note up an octave in m12. Also heard the m5-6/m9-10 chords a bit differently so I changed those as well. Let me know what you think of all this!
-m15 RH: The Bb on beat 2.33 sounds like it should be down an octave.
-m16 RH: Hearing an additional F on beat 1.33, you could also leave out the low Bb to avoid the repeated note. Beat 2.33 sounds like Ab-C-Eb bottom to top.
-m18 RH layer 2: Hearing the beat 2 chord as G-Bb-C-E bottom to top, feel free to leave out the low G since the melody has it already and it's a bit of a stretch.
-m19 RH layer 2: Hearing an Ab-Bb-Eb triad on beat 1, the Ab is probably fine to leave out though. The Ab on beat 2 sounds like a Bb to me instead.
-m20 RH: Not hearing the Ab on beat 1, but I do hear an Eb and F, and an additional Bb on beat 2. You could put the lower harmonies into layer 2 here for consistency as well.
-m21 RH: This should all be up an octave, including beat 1 of m22.
-m27 RH: I hear Cs under both chords.
-m28 RH beat 1: Hearing this as A-C-F bottom to top.
-m31-32 RH: There's a descending line that goes A, G, F starting on beat 2 of m31 that you could include; in m32 you could move it into the LH since it gets pretty low.
-m33-40 RH: Hearing some additional harmonies here:
I'm going to echo Kricketune's request that you use flats for m36, reading an E# in the key of F is unnecessarily confusing. The move from Cb to A in the bass is indeed weird, but so is Eb to C#, which is what you currently have in m35-36. This is just kinda what happens when you do enough downwards whole tone movement; you'll eventually need to cross over from flats to sharps/naturals to maintain readability, which unfortunately means using a diminished third somewhere. The trick is where to put that diminished third. When in doubt, use the option that creates the fewest accidentals; Db major has one less accidental in this key than C# major so it's preferable to read here.
-m37 LH: Not sure how necessary the gliss is to include, but up to you.
-m40 LH: I don't think a discrete 16th note really captures the bass slide here, a grace note would make more sense to me.
-m4/52 LH: I'm hearing the two bass notes an octave lower than you have them.
-m5-m12 LH: I really like the idea of including the chords on the offbeats, but it seems like a shame to only do it for the first few measures. How would you feel about raising the bass an octave in m7-8 etc. and adding some more offbeat chords there? To me it sounds a bit empty without them. Here's what that could look like:
Spoiler

[close]
-m15 RH: The Bb on beat 2.33 sounds like it should be down an octave.
-m16 RH: Hearing an additional F on beat 1.33, you could also leave out the low Bb to avoid the repeated note. Beat 2.33 sounds like Ab-C-Eb bottom to top.
-m18 RH layer 2: Hearing the beat 2 chord as G-Bb-C-E bottom to top, feel free to leave out the low G since the melody has it already and it's a bit of a stretch.
-m19 RH layer 2: Hearing an Ab-Bb-Eb triad on beat 1, the Ab is probably fine to leave out though. The Ab on beat 2 sounds like a Bb to me instead.
-m20 RH: Not hearing the Ab on beat 1, but I do hear an Eb and F, and an additional Bb on beat 2. You could put the lower harmonies into layer 2 here for consistency as well.
-m21 RH: This should all be up an octave, including beat 1 of m22.
-m27 RH: I hear Cs under both chords.
-m28 RH beat 1: Hearing this as A-C-F bottom to top.
-m31-32 RH: There's a descending line that goes A, G, F starting on beat 2 of m31 that you could include; in m32 you could move it into the LH since it gets pretty low.
-m33-40 RH: Hearing some additional harmonies here:
Spoiler

[close]
-m37 LH: Not sure how necessary the gliss is to include, but up to you.
-m40 LH: I don't think a discrete 16th note really captures the bass slide here, a grace note would make more sense to me.