Quite a few interesting ideas, but I feel you need to look at the overall shape of phrases - and especially where phrases begin and end - it is often quite difficult to tell! One other thing - my composition teacher always told me to write for what is possible - some of your recommended tempi would be almost impossible for virtuoso performers.

Having said all that, I do like some of the comtrasting ideas you have used. In addition, the sheer scale of the piece suggests a lot of work to get all those notes sorted out. So overall, interesting ideas in part, but a somewhat confused structure.

Now I shall duck for cover!