This is a fun potion brewing game! I got pretty far (unlocked the library), the game crashed once while I was trying to figure out the Animal Potion, but finding out that the game saves is a pleasant surprise. I haven't 100% the game yet, but it is possible with enough time. I found that Zap Potions were the most viable as you gain a net of 4 coins from selling them, but is terrible since you have to spam the agitator minigame a lot for them. The Animal Potion was also hard to make with such a small success bar that I only managed it once. I would probably suggest allowing players to navigate the book with arrow keys since it would place you at the start every time and I would usually have to wait a second or click twice to move to pages in the back. The minigame is fine if the player doesn't need to spam like I would need to with the Zap Potion. There is a lot of content here, but with how costly things are if you make a mistake, it can be hard to experiment to try and find recipes. (I only managed to find the Zap Potion by a wim. Can you tell I like the Zap Potion?) I do however liked that you included the library which allows you to pay the cost of a mistake potion to research instead of having the player waste time and resources through experimentation. I never managed to fill more than 3 potion slots so its nice that you give room for those who slowly build up stock through a brew and sell cycle. I did find a bug that the Zap potion requires the Red, Orange, Yellow order or else it registers as a mistake (such as Orange, Red, Yellow) despite what the ingame book says at 100% for that potion.
All in all, you did a "brew"lly good job!