A little feedback:
First, I know it's a matter of preference, but I think the girl without glasses had more charm. - The ability to take them off would be cool. Of course, there's no point in messing around with mixing ingredients. A simple option in the menu would be good

I really like the marble games, but I see that many people have problems and it's quite a higher level for people who have never played such games. Skipping such a mini-game is too much, but maybe the ability to play several easier levels instead of one difficult one?

And third, most importantly: I think the game would really benefit from a compendium of known potions. I know there are PDFs with all the combinations, but it takes away the fun of experimenting. A simple book on the table or on the UI that fills the gaps as you discover new mixes and shows how many is left would be great

Other than that, the game is awesome
I hope it's not the last one! :>