Enter the store post game over:
Could work with "essence" of faun.
And among the things I could add things like an upgrade to reduce stats consumption, a trunk to store some items, costumes with skills. And other things
You have several good ideas.
A few of them are already planed, such as the merchant and companions.
And I agree that the home needs a touch up in terms of graphics.
House expansions: Currently only a dungeon is planned
Adding a prop that shows the current level of corruption in the region is a good idea and will be added.
In terms of an end game screen where upgrades can be purchased depending on how well you did sounds like a good idea as well. I'm not sure how it will work yet and it will likely be while before it shows up.
Well this is an idea but when you add the home menu add the extra to access the gallery directly and another section for the store.
Now the "difficult" part is how to balance it...
It can be through repeatable achievements in a game, by raising a quantitative level when you die or directly give you points for your final stats but how to make it not so easy or difficult is the question.
(you could also add some erotic Game Over depending on which creature eliminated you).
In other words you can take advantage of the fact that your character is not a human but a faun.
Look for things related to his magic to support you