First track - first rejection. Please, help me to understand and move forward in right direction

Hi, Thank you for your submission.
But, this item does not meet the general commercial quality standard required to be accepted on AudioJungle, unfortunately.

I ask you to listen to my composition and give your opinion: the reviewer means that the audio quality is not good enough, or it means that the composition quality is not good enough?
I would appreciate all your suggestions and critics. Thanks!
Here’s the track:

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Hi, not bad but the piano sounds too robotic and there are some mix issues going on.

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Thanks a lot for your suggestions, I really appreciate it.
I would be very glad if you would say a few words regarding mixing issues that I should pay attention next time I create something like that.