I had a quick look. Looks fine at first glance, will try it out for a project of mine. I planned to use axum anyway.
One suggestion: You should tell in about two or three short sentences in Readme.md how it extends axum, especially what it did to destroy the boilerplate of axum.
One suggestion: You should tell in about two or three short sentences in Readme.md how it extends axum, especially what it did to destroy the boilerplate of axum.