So happy you have pass through it! (Even though it is a celebration after 3 months😅) Currently I myself is stuck in my first movement of String Sextet...
This is a really interesting piece. The flow is much better, rhythm more varied and power retained. And you play it really well! I really don't care about the slips because there is fire and power in it.
For my personal choice I will tranpose it to other keys, not necessarily the relative major. I think the movement is quite monotonal with both themes in C, regardlesd of its modality. I remember Mahler also retained the keys in the recap of his first movement of Second Symphony, but there is at least the contrast of c minor and E major. In the development I won't put that much time still in C major/minor. Maybe I will put the 2nd theme in remote keys like F sharp minor or E flat minor to give more contrast, but this is only my personal choice.
I think it's ok!
Fot the part writing, I think @Tónskáld is right. I think there can be more interations between the hands, such as imitation of the motive in both hands and juxtapose them to build up a climax. I think the melody and be split in different voices, not just staying in either high or low register for several bars. There can even be some counterpoint usin the first four notes of first theme.
For me the semiquaver chords such as in b.134 is really difficult to play. I will only retain the upper and lower octaves with middle notes tied.
For my personal choice there can be an anticliamx. The piece is quite saturated with the opening and really passionate. Maybe some cool down time can create contrast of dynamic and texture.
This IS a great movement! But as @muchen_said, I think it's better the finale, because I think it well suited to end the sonata in this way, grand and passionate. Maybe the first movement can be more tragic? I really love the fire in it!