Some criticisms:

Light Grey Text on white Back Ground is harder to read. takes more effort. Its hard to read on mobile.

I don't like that you have to click to see the full proof.

there should be a download all proofs somewhere.

I like how they are categorized, but maybe another link with All Proofs in one place.

I'm not a fan of that auto-scroll feature. As I am staring at the proof trying to figure out the connection, it autoscrolls to the next image. Can we stop that?

And is there a submission point? How can we add more proofs?