Thank you very much for everyone!
To answer some question: I started to learn this piece on friday, 3 days ago.
My hands have tension mainly because I made the recording after I played this 30 times in a row

But I must improve the looseness really.
I wouldn't like to learn the entire piece yet , just some part of it, because the technique is very interesting, what I find in it, and much more interesting than any other pieces what I learned. It's very different and other feeling.
It's an etude so the main thing is the technique, it's absolutely impressive, what this piece provide for the pianist.