I hear you playing much with rhythm here. Parts of it seem kind of like folk dances / tunes, something like what Bartok would have done.
My suggestion would be to try and explore more the range of the piano. You can achieve implications of accents, and changes in timbre. Also don't be afraid to isolate some passages within a narrow range in the piano.
Have you explored chord clusters and elbow / fist / forearm playing? I find such can be used as effects in such rhythmic music - kind of like simulating percussion insturments. Also if you have access to an accoustic piano, plucking the strings can also produce more rhythmic effects.
Good stuff
Actually, I was using my fist at some point during that to let out more on the right hand. I think it was at the 9:00 point somewhere where I switch to fast changes between left and right. That's one of the many spots in this that I want to expand on and try to create into a sonata or concerto, something like that. Also, there's a scale that I kind of fell in love with, even if it's awkard, I'll get to that some other time when I do another attempt.
Also, I put in an easter egg at some point in the music for Prokofiev.

I'll try the elbow thing though, sounds fun.