It's great, but I sure hope you provide an installation script, because certainly, this is not going to be hosted on any public website.
Maybe it can even edit the /etc/hosts and make a local domain name for the browser to get to this PWA instead of using an IP address. Since you did mention that it's intended for mobile (mainly, I guess).
The website provided by localtunnel is somewhat random, and I may be able to make it longer and more secure. It’s your own personal url, but it could be better.
I’m working on options to self host. It looks like this will require opening ports on your router and installing an SSL, so I’m not sure if that can be easily solved. This may just be a trade off. Personally, I would rather use someone else’s server to display a GUI of my node, than to trust someone else’s node.