This already was dicussed several times ago, he told me that whenever he completing a quest, new ideas just coming up and he ends up leaving new unimplemented options. Well that's a good spirit because he always wants his game to be its best, and the problem is he's working alone, without a proper script writer or a plan. So instead of having the oriention for the following update, he mostly improvising.
But he's actually a good dev, who listened to his players, and in facts the game getting better and better through time