Congratulations on submitting to the jam! I'm very impressed that one person managed to put (very nearly) all of this together within the time limit of the jam.
I actually played this game once, left it for a couple of weeks, and came back to revisit it. On the second playthrough, I noticed a lot of connections between the clues that I'd missed the first time. I think the connections might have been easier to make if it were possible to distinguish a little more between the painting styles of each separate artist, but I understand that's a big ask with one person handling all of the artwork for the game!
There were a couple of deductions that I didn't feel like I could make with 100% certainty, but overall the narrative was well-reasoned. I enjoyed the music, and the ability to switch between rooms without losing progress made everything much easier to parse. I particuarly liked the variety of objects and media available in room 3. As someone who specialises in fine art, I'd love to know more about the roots of the Surradist movement and why they were so invested in the particular idiosyncratic practices we see in the demo. I think the concept is great, and I look forward to the full version!