I think this is a delight! Your control over jazz harmonies and rhythms is quite impressive. The pianist is really talented. This reminds me in many ways of Liszt (especially around 2:22), if Liszt had had a more expansive jazz vocabulary. It also reminds me of Japanese jazz (especially around 1:42), like it belongs as background music for an anime movie. But this is quite virtuosic at times, and evocative! Great job using harmonic motion to tell a story.
Your return to the main theme gives this piece a hint of form, which helps prevent it from feeling like a stream of consciousness improv. Some listeners really need to hear a strong form in order to feel comfortable with a piece of music. You may lose some people that want to hear music with a more cohesive, linear quality and clearly defined form. I am not one of those listeners however; I enjoy pieces that wander and search and quest, and I appreciate the artistic potential of such a set-up. The fact that you are portraying a character, in my opinion, gives you total leeway to follow the concept to its end and invent your own forms to suit the character. My only recommendation would this: don't allow every movement in your planned suite to wander too much without a solid form. Give the listener a couple movements interspersed throughout that are anchors, something more predictable to give their ears a rest in between more frenetic movements like this first one. That way you can strike a balance between chasing your concept and creating a piece of art that is actually enjoyable to listen to all the way through. Too much chaos can wear out the listener after a couple movements of it. Thta's my two cents. (I have always struggled with this very thing as a composer).
What you start at 4:52 is delicious.
Cheers!