Well of course my opinions are mine alone. You may want to wait for some more feedback. If others here do find your improvisation creative and interesting, and actually understand
it (whatever that means) I would like to hear. If nothing else, they might be less abrasive than the admins, who are not known to gild the lily. Maybe you can yet improve the status of classical music in our society. For me there clearly is no hope
Some specific criticisms on your improv. To my uneducated ears it lacks a beginning, and ending, and a theme (or maybe I just don't hear a theme), it is about 6 times too long for its content, and the bit around 11:00, and most of what follows, is positively ugly - sorry, no better way to put it. But again, that is just my opinion FWIW. I can hear that you have a good facility, but it seems a loose cannon. The ability to produce a lot of notes is not a guarantee for good music (believe me I've heard some stuff here...).
Ok that's it from me.