Here is the development repo: https://gitlab.com/lordadamson/Super-Flat-GNOME-theme
This is based on the Super-Flat-Remix-GNOME-theme https://github.com/daniruiz/Super-Flat-Remix-GNOME-theme
Credits to Daniel Ruiz de Alegría the original designer of the theme.
Font colors are now black for better readability.
to get the whole experience in the screenshots you may need to install the simple dock extension and the numix icons.