The sound effects were very good, especially the wind when you fall. So, the absence of music was quite noticeable. The overall look is fine for a game jam, but it wasn't clear what parts were platforms. Colouring/texturing them differently would easily resolve that. The wall jumping was quite tricky, as was landing. Some of the walls didn't have collisions.
So, with some quite minor tweaks this would have been a great entry. Keep it up.
A solid effort.