I have made a few simple sites with hyperapp in its various stages of development. I am not advocating that any of these projects represent the _proper_ way to build a hyperapp (or a web app in general for that matter, I am learning too) but they are hyperapps.. in production!
Site: https://audiostream.world Repo: https://github.com/joextodd/audiostream
Site: https://browses.io Repo: https://github.com/browses/frontend
Site: https://plural.video Repo: https://github.com/lukejacksonn/plural
Site: https://hyperapp-hn.deployable.site Repo: https://github.com/lukejacksonn/hyperapp-hn
There is also https://github.com/hyperapp/awesome-hyperapp which is full of much community goodness.
Hope that helps! Join us on slack if you have questions :]