Why this plugin rejected?

Hello CodeCanyon Authors,
I submitted an item last week to codecanyon but not sure why it was rejected. here is the link to the demo http://testiowp.com/

My best guess would be that there are already many plugins which do the same thing: https://codecanyon.net/category/wordpress?term=testimonials

How does your plugin innovate beyond what the others include, aside from a few admin UX improvements? If this can’t be answered with a list of at least a few major bullets, then that’s probably a good start on a rejection reason.

Is there any possibility for code quality? Here is the reviewer message:

Thank you for your submission. We have completed our review of “Testio - WordPress Testimonials Manager Plugin” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again.

We appreciate the effort and time you’ve put into creating your item. And we’d be happy to help make sure your next entry will meet our submission requirements.