Hi there,
Thanks for the feedback. I never consider myself an expert in coding, but Gutenberg do not required too much coding as everything is generated by the builder.
I uploaded fixes for the missing responsive text wrap and menu. The menu didn’t seem to work in the builder, but work fine in the frontend. Nevertheless, it should be fixed now.
As for the HTML validation and typography issues, I am not sure if I understand. Mind to further explain?
If you find any issues, let me know and I will take a look. Fixes will be provided.