Thanks for trying out our game and for your input! We're more than happy for any constructive criticism you can give, cause it gives us some direction in ways to improve!
The tooltip and limited failures are good ideas that I agree would help with the flow of the gameplay. We were initially planning to have a potion creation page as well as different endings depending on the success of the sales- particularly to what type of customers - but we were short of time, unfortunately. It is my hope we will get back to it some time in the future. :)