Fantasia in C minor for organ (work in progress)

This is a half-finished piece I started over the summer on which I hit a wall.  It's an organ work, inspired by Mozart's Fantasia in F minor for Organ.  There are parts that don't sound quite right but since I've listened to this so many times that now I can't really be objective as to which parts work and which part don't so any honest feedback is appreciated.

The score is quite a mess but I've attached it as well.

I like it. Sounds like a master's work. 

I don't think that my understanding in music is deep enough to give you a good feedback for this piece.

It's clear that you learned classical music theory, the thematic material is well repeated and the chord progression are complicated and keep the piece intresting althouhg it's played by one instrument.

Also, some parts, like bar 31, seemed a bit too complicated to play by leg (as far as I know the bottom base line is for the pedals).

@Rabbival507 https://youtu.be/LnKJpYGCLsg?t=1340 Linked at the organ part.
@bkho, if you're struggling with being objective about your own works, it helps to do a thorough harmonic and Schenkerian analysis, to see where your pieces miss notes and thematic development respectively. If they can withstand that, then they work in at least one way.

Sorry for the delay in my replies, thanks for listening and commenting.

Ugh, the idea of Schenkering my own works gives me nightmares.  That was the one aspect of music theory that I struggled with in college.

It's a lot of fun to listen to this piece--the organ is truly the king of instruments, as Mozart himself claimed!

I really enjoyed the passage from m. 54 to m. 61. It was wonderful (albeit a bit familiar) harmonic progression that built a lot of tension before landing on that big G Major chord. However, the section from m. 62 to m. 69 kind of just reused that same progression and ended with the exact same cadence, and I feel like the repetition didn't really add much to the music. A big half cadence like that suggests to me that something impressive and new is coming up--a passage of brilliant virtuosity (maybe some fancy footwork) or of great contrast, like the softer section that comes next. 

As for where you go next, I suggest drawing inspiration from Beethoven's Grosse Fuge: 

Beethoven begins with a similar structure--an introduction, a polyphonic fugal passage, and then a softer B section. He transitions out of the B section by reintroducing an ominous theme from the introduction, completely out of context. I think you can do the same thing here, even if you have to fragment an earlier theme and just use part of it as a short motif while maintaining your more peaceful atmosphere. I would choose a theme from your fugue, as you've developed that the most and it'll probably sound familiar to the audience's ears.

I hope this helped, and I look forward to hearing this piece in its completed form!

J Shu

Thanks for the additional feedback.   The sudden ending is just a placeholder.  My intent is to have the ascending chromatic harmonic return in embellished fashion and conclude with an elaborate reprise of the fugato section.