Very nice! :) I also had a similar itch a while back and built https://gamescape.app (during the pandemic). Different focus -- all about shared maps and tokens rather than a "full" VTT. Plan is for it to be free forever. Can't work on it anymore since I started a startup that eats 100% of my time, but totally usable (my group uses it every week :) ).
This looks exactly what I started building awhile ago (and then bailed when I discovered Foundry). Do you think you'll ever release the code so it can be self-hosted?
I've toyed with OSS'ing it or releasing the code. It would be a non-trivial amount of time and energy to package it in a way that people could host it. Gamescape was a hobby thing so I used some different architectural patterns I'd been wanting to experiment and play with that aren't totally standard.
