Thank you! Yeah the player's stats do change, but the stats don't change anything tangible yet. As I keep working on this, I'll make it so you can tell what each potion does, add several spell variants, boss fight(s), and maybe some special potions. Even though the Jam is over, I'm not done with this project :).
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The effects of each potion are determined by the ingredients you put in it. Some special recipes will be hard-coded in, and there are synergies between certain components. I might add a "recipe book" that records what potions you've made, what ingredients you used, and what effect each potion had.
The effects won't be revealed before you drink the potion. Unless you've used the same recipe.