Sorry, been offline.

You have an excellent start on this piece, you're very relaxed with it and don't seem intimidated by it.
That said, it's a bit slow. Medtner indicates 120 a quarter note, your tempo is around 100. A faster tempo will give the piece more forward motion; right now it's a bit stodgy, particularly in the rhythmic fugato passages on pages 5 and 7. Also, the syncopated passage on page 2 (first three lines) misfires, it's not exactly in time. My other main observation is that the whole performance is rather monochromatic but that may have to do with the piano as much as you. Still, make more of the dynamic contrasts.
There are other inconsistencies in rhythm and technique throughout the performance but I think you're definitely on the right track. Speed up the tempo, tighten the rhythm and add more tone color. An excellent start on a really tough piece!
