Seems interesting.
Would it be a lot of work to add a Lua interface? I think this tool could be very useful for indie devs working on LÖVE/LÖVR projects. I noticed Lua is not part of the roadmap.
I worked on a pong clone last year and it was quite a pain to get the networking reasonably right. It would have been nice if a tool like Hathora could have been used instead.
By the way, does Hathora support NAT hole punching?