I was inspired by the video, but got bogged down by the lack of clear documentation of the glimmer-dsl-libui methods and arguments. Without traditional documentation, only really having the examples lead to a lot of hunting around and very slow progress.
If I missed the documentation and someone knows where it is, I'd love to read it. I think though that since this is a wrapper library there is instead reference to the underlying documentation (whose method names are a bit different, and whose arguments are a bit different) and I find that translation very challenging; especially since glimmer-dsl-libui is not yet complete, so your run into ineffective keywords if you rely on the underlying glimmer docs.