Yes, its unsteady tempo should be good, but....

I like the way you use wide range of velocity and tempo to create express realism; however, I could say you exaggerate these features so much that sometimes it bends a little off the natural beauty. 0.38 seems outrageously loud for me though. The notes sometimes go quite fast when you have 1/8 note on the fast tempo bars, compared to the rest. The low tempo range has greater difference than higher ones (like 60 - 80, and 140 - 160 are really a lot of difference).

So just keep things less exaggerated and you'll be right on the spot. :)

Some transitions are well placed

But some moments in the melody, especially at the beginning (the high keys) dont seem to fit in, also remind me to much of kingdom hearts.

But its far from bad.

Oh and im one of those people that can keep a steady beat without a metronome to be honest. :p

Ill look at your other piece, i also need to suggest to think of some more decent titles unless you mean something with it that you havent added to your description.

So beautiful at 1:00+

Your excellent when it comes to piano.