Not trying to sound mean, but I think something is wrong here. You can’t just quit your job without any proven means to sustain yourself. It’s like jumping in an ocean hoping not to drown even if you can't swim.

I feel like there was no indication whatsoever that would have compelled him to quit and focus on his own game(s). Ideally, he would instead have released the game while still employed, and then quit only if the game becomes a success.