Hello guys.
I worked on it 4 months and now it's officially ready to be used. There are some minor issues. But in general it's ready:
https://github.com/sergeyglazyrindev/uadmin
Docs:
https://uadmindocs.sergeyg.me/docs/intro
Features:

1. More cleaner code
2. Full gorm support, no need to prevent sql injections, because everything handled by Gorm.
3. Migrations
4. Blueprint system.
5. Nice and easy to use command system that let you easily add your own custom commands
6. Embedded static files and templates, no need to deploy it with your project, now you just need only binary
7. Almost everything from old uadmin works good.
8. Powerful form system that could be used to produce almost anything in the admin panel.
9. Make helpers to keep your code clean: like make fmt (formattes code), make lint (validates your code against standarts), make docker-image, etc
10. Easy to expand/customize and with a great perspectives.