Neat piece! Aside from what Bloop said above, here's my feedback:
- For m. 4 and everywhere else in this part, I feel like the staccatos aren't necessary for the two 16th notes at the end.
- I would suggest taking the staccatos off the downbeats (i.e. lower notes) in the left hand of m. 9-12. The accompaniment seems a bit too light if everything is staccato and emphasizing the low bass notes would give it some more weight.
- m. 13 beat 2.75 RH: I think this is a C instead of Bb, similar to m. 38. (I hear the Bb in m. 15/40 as you wrote it though)
- I think the last note in the first descent in m. 25 would be better an Eb instead of D (D gets in the way of the melody on beat 2, and something is playing an Eb in this measure)
- I think the descent in m. 29 RH has an F at the end. Maybe make it a sextuplet, tied to a half?
- Beat 4 of m. 49 LH would be better off with the clef change starting there.
- Beat 4 RH of m. 50 is D instead of C
- m. 67/71: I don't think the D harmony underneath the F fits, since we have a Cm chord here. C might work better. Also, on beat 4.5 I think I hear a higher Bb in m. 67? As opposed to 71 you could just make the beat 4 Bb a quarter note.
- The last system is rather cramped. I would suggest using 3-measure systems starting at m. 33 and 36, then 2-measure systems from m. 39-50, then 3-measure systems from there, with the last system having four measures. That'd distribute the space a bit better. The slurs may need some adjusting if the distribution is changed. Let me know if you want help with this.
- The notes get really high off the staff in the RH in the end section and the staves should have a little more room above to compensate (particularly between the header and first system on the last page).