WOW I'm so impressed by your game. It is so fun, fits the theme so well, is so polished : I could literally buy it as is. The tutorial is very nice, the mechanics very well introduced. the game is addictive, has a nice game loop, great art and nice music and sound design overall. 5/5
I'm sure you have more ideas on different challenge that could be implemented and I look forward to it. I also know you still need to update it : maybe the physics of the objects were sometimes annoying because of them bouncing around but I took it as a challenge to redo the exact same thing I last did but with the extra pressure of the time running out and it became even more fun. Same thing with the book : I didn't put the game in full screen mode right away so I couldn't see some part of it. But again, it made for a fun challenge just like if part of the book were ripped : I had to test out different recipe or memorize them even better to get it right. Maybe a shelf where I could organize all of my vials and potions could be nice. Also I don't know if anyone commented on this but when you click on the empty potion it generates a bunch of them. which gave me the most cheated score.
It got me interested in the other games you made ;)