Need opinion for rejection

I have developed a script for managing warehouse stock using PHP Laravel and Flutter SDK.

Web Demo:
My demo is at and you may login with

Password: 123456

App Demo:

The script is developed from scratch and it took 6 months for Web and Mobile platform development. The moment it was uploaded, I got the rejection within 5 minutes and this is hard to digest.

I need your opinion on my code.

Please give me your feedback.