Okay, the sheet is updated.
- URL missing a / at the end
Actually the URL isn't missing, or what exactly did you mean?
- You can just use a tenuto mark (horizontal line) instead of "ten." in the first system
What horizontal line? I wrote like this because it's also in the urtext edition.

- For the "surprise" chord in m. 16 the ff doesn't have enough room - it's colliding with the stem of the LH part. You could either widen the space between the LH/RH staves or flip the LH octave down.
I flipped it down.
- Also about the chord, I would suggest adding accents and the fifth (D) to give it some more punch.
Cool idea, updated.
- The left hand in m. 23-24 and 31-32 should be an octave lower.
Hm, in the orignal both octaves are played, but in the lower octave it sounds better, you're right
- Extra mf mark in m. 25 is not needed
deleted
- I don't think you need the (pp) in m. 9, it's not really any different from the beginning is it?
In the absolutely original it's written with a pianissimo, so I thought the player could choose if he wants to play in more quiet or not.
- I would suggest reducing the space between systems a little bit so you have room to put the footer within the page margins.
I did not really unterstand the topic you've linked, so I've tried a bit in the sheet. I don't know whether that is it.