I broke my high score, and it saved it again. I tried to find a logic to it, but I couldn't. I saved a state right at the end screen, and if it doesn't want to save the score, it won't.
By the way, not sure if related, but on Onion OS (fake-08, by the way), selecting "Try again" does the same as selecting "Quit"—it just sends you to the start screen.