Envato wrote me to significantly improve UI of the application! Does anybody face with such kind of

Envato wrote me to significantly improve UI of the application! Does anybody face with such kind of problem? Maybe there are special scripts to do it?
Here is the msg after rejecting:
Unfortunately, I feel your item, in its current state, looks and behaves in a rather generic manner. With more unique features, I’d definitely be happy to take another look at this.

I will need you to significantly improve the UI of the application. It looks too barebones right now. I’m not asking for utter sophistication, just acceptable levels of refinement. If this were a class or a snippet, I wouldn’t mind if it had a bad looking demo but since this is a complete system I have to take every facet of it into account.

We appreciate the effort and time you’ve put into creating your item.