ongaku_oniko, where have you been? I came back to this thread and listened to your recording more closely. Sorry I didn't respond earlier. Since this etude was a stretch for me, in terms of my playing level (and literally, because of my hand size), I don't feel adequate in giving you advice. But since no one else has responded, I will try.
In the beginning section, the chords in the left hand are all of equal value. The time signature is 2/4 and each chord is an eighth note, so each should receive the same amount of time - none shorter or longer than the others (except for measures 7 and 15, which contain one quarter note each). The way you play the chords in this recording suggests a dotted rhythm, which is what I believe is making the rhythm sound "off".
The second triplet of each measure is being scrunched, since the corresponding chord is being played too short. Play the right hand by itself and be sure to play each note of each triplet evenly and don't rush or skip any of them. I can't tell exactly what your right hand is doing there because it's so fast, but the notes are not all clear.
Starting in the second section, your playing of the left hand chords is correct and even, then once the ascending octaves begin, you are changing the rhythm. Again, those should all be even, except for a couple of quarter notes.
Third section: same as first.
Fourth section sounds the best. In that part, and the rest of the piece, it just needs more practice, becoming more familiar with the notes and making sure to play them as accurately as you can. And I think you should add some pedal throughout the piece. I hope you are finding time to practice and a piano to use. This etude is going to sound great once you iron out a few little details! I hope some of my feedback helps. I enjoyed listening.
