I believe there was a post about this earlier that the game is solved[1]. Interesting game for those who don't know that, or who want to go through the exercise to figure out the correct strategy.
Ultimate Tic tac toe, check. Angular, check. Firebase, check. GitHub, check. I cooked exactly this recipie a month ago: https://github.com/Barnabas/tictac9x.
I'm not complaining; delighted actually. This game is a perfectly natural combination of these technologies. I imagine this happens all the time. Good job.
Thanks :) Firebase is pretty neat, especially in combination with Angular's two-way binding; which essentially means a real-time app out-of-the-box .. without a backend!
So all you have is a static page :) which is why I could host it on Github pages
[1] https://www.joachim-breitner.de/blog/archives/604-Ultimate-T...