I must say I'm not entirely blown away by it. It's unique feature (frontend/backend coupling) kind of feels like it's just a re-engagement with the traditional web app. Or even just akin to a mono repo for a modern frontend/backend.
Beyond that, it's main let down (which is in no way unique to it) is not having a straight forward application entry point that allows you to wire things up as you see fit (composition root). Instead we get a request handler that we hook into another server technology that in turn makes their controller equivalents work like magic.
My struggle with it, as of this afternoon, was to figure out how to bundle raw SQL files in the build until it became apparent that you have to unbox all the Vite functionality and do it that way (which seems to have some depth) or literally have a parallel step outside the build for copying the files into the build dir. Not the greatest experience for what is a pretty basic step (embedding resource files in the build output).
Very much feels like a project that is just a small twist on what already exists in the ecosystem and will fall into the growing black hole of JS web frameworks. Sorry to be glum :/