The platforming feels pretty good. I didn't play very far in - I think it takes you a while to get to the point, and I would personal think about how either to make the way there more interesting, or in shortening the route (maybe considerably, but that may be a personal style).
I didn't read the inter-level text as I was playing. I was content enough playing the levels, and for me it didn't feel like it was adding much.
I stopped when I got here, realizing my mistake too late but not wanting to redo it. 😅
I think the elements you've chosen for game objects (one-way platform, gravity flipping, crates, etc) all work very well together.
S