Wow, thank you very much for kind words and the detailed feedback!
I was afraid that "no Focus regeneration at zero focus" thing would be a problem, but it totally slipped my mind while I was polishing the rest of the game. I also was so busy worrying about the end of the game that I didn't actually get enough time to test it all the way through from the beginning...
Will definitely test it now, add that to the list of upcoming fixes and get on it as soon as I can!!