I like the game concept. I think a 'sell all' button would be useful rather than having to scroll through the list later on.
I also would suggest adding extra potions that use existing herbs in different combinations, or using more than two ingredients in a recipe. This could add a little more balance as some recipes require a certain herb to be upgraded to an expensive level, while it's counterpart remains cheap.
Thanks for your feedback and ideas. I will consider to make a content update with new herbs/potions that don't follow the same rules as the current ones (e.g. a potion that needs a new herb and an existing tier 3 potion)
Thanks for your feedback and ideas. I will consider to make a content update with new herbs/potions that don't follow the same rules as the current ones (e.g. a potion that needs a new herb and an existing tier 3 potion)