Hard reject because my app doesn't meed quality criteria?

After long preparations for my listing, I got this discouraging message from the Envato reviewer team:
“Unfortunately your submission doesn’t meet our current minimum technical quality requirements for the category it was submitted to. Please consider taking some time to familiarize yourself with our current library and quality levels of popular items before resubmitting.”

You can see a live demo of my app here: https://appetize.io/app/0waaxqq8zhwzp4c9dvghv2mkgc

It is beautifully designed, and functions as intended. Any advice?