>Prosperity and prestige need easier ways to increase
How so? As you said low prestige isn't very impactful.
>Selling treasury and winning big beggar should have 10* the current value.
I think that'd be too easy to horde money and lose some point to the game.
>The Bad End Button should let us choose bad ends
It's suppose to be the "Game Over Button" that let you throw the game with current status, but I suppose it's hard to manage the variables.
>Storywise, it would be great if both the agriculture and tribal regions could become duchies
I can understand why you'd want the tribes to become a subject, but the farming province is already a province directly ruled by the kingdom, there's no point in releasing it out to be a subject nation.
As to "develop the nation into an empire", I think my focus will remain on the current plan of main plot keep the kingdom running and keep the throne to yourself. there won't be too much expansionism going on.
>I would make a "marry no man" aka either "married to the state" or "marry a woman" option
I do have something similar in mind, but that will be touched upon when we actually reach the end game part. As till now there's still not an ending to the game.
Thanks for the feedback.