Please give me your feedbacks to my rejected tracks. Thank you !

Hi,
I submitted track to aj but it was rejected.
I’n glad i you give me some advices and feedbacks to my track.
Thank you!

https://soundcloud.com/takumihigashi/piano-solomemories

I would increase the tempo a bit.

The piano playing sounds very unnatural.

Thank you for your advice!
though nannot submit this tune, I try to make it tempo up and make it better.

Thank you for advice.
it’s surely true, I make it quantize and put tones using piano roll. So I play tune real time, and try make it sounds better.
I really appriciate your advice and thank you so much!