I found a bug in the gameplay. If you start loading in the ingredients to make a potion and then try to go to the shop to buy more ingredients, you don't get the ingredients back, and the visuals disappear. The ingredients are still being used for the potion pot, but you can't see them. I think they either need to be displayed when returning to the brewing screen, or if you leave the brewing screen while ingredients are in the cauldron, they get removed and returned to you.
Otherwise, not a bad game. The art style is a bit simple, and the gameplay is a bit repetitive but the process works, buy ingredients, brew potions, sell potions, and repeat.