Rejected Item Question

Hello Everyone!

I’ve been a part of Videohive for over 6 years. I upload pre-rendered animations most of the time. So I made this abstract loop animation: and it got rejected. Can anybody tell me what is wrong with this design? I’ve never received any feedback from the reviewer. How should I improve if he/she is not pointing out the problem? The default message is not too helpful: “Unfortunately, this animation does not meet our criteria.”