Promising game. Not a lot of content but what's there is pretty good.
Hairs and seed were hard to find. And still haven't figured out secret 2 (can't even find a hint, is it a combo potion like bimbo + "personality" or maybe flying cock / cock portal + bimbo?).
The names feel a bit inconsistent, using the original names from the book at times, parody names at others (Nevi is obviously Neville, Malfoy/Malfus is Draco, Minerva, etc).
Because I discovered the recipes in random order the character progression felt all over the place, in one scene H loves sucking cock, in another she barely wants to touch one. I prefer games where you have to work your way up, like in say Witch Trainer, since it delivers a more consistent story. Would be nice to have different reactions to potions depending on what other potions H already tried. Maybe using a counter for each unique potion used to change her personality? While I'm dreaming having the game actually take place over several days would help with this, heck people could try to finish it in as few days as possible if there was a limit to how many potions you can try per day. And then you could eventually have a second load of books and a new page in the diary...
I love the diary but the icons needs a little something to differentiate between what you've completed or not, maybe grey them out when incomplete, colour them when complete, etc.
Usually the ESC button brings up a pause menu (which includes an option menu, hint hint) when not already in a menu, doesn't quit the game.