Since a game typically doesn't have a first mover advantage nor suffer from a "time is of the essence" problem, and given your opportunity cost of income, you should consider outsourcing the development of your game to a cheaper labor market. With your technical know how, you can supervise your team to your liking, launch the game, and see how it goes. While you still might be unhappy at work, this will preserve more of your savings than quitting, and give you a more viable option to quit in the future.
Not sure why you are getting downvoted, as this is the best solution that I have seen so far. Even in the Bay Area, 500k salary is an outlier, and the op can easily afford to hire a part time local developer or full time in a lower cost of living area.
Another similar option would be to look for a co-founder, and 'self-finance' the company initially. I am sure there are some folks out there who would happily take a lower % of equity in exchange for a small salary. And the added advantage is you essentially have unlimited runway.
