Phew, beat it! Night 8's got me stressed! :p
Nice take on the potion brewing genre, was very addicting. Looks great and I love the music too.
Loved the reasoning for the handle-bottle mechanic xD
There was a good balance of introducing new mechanics to keep it fresh.
I'm pretty sure there's a weird quirk where if you "play well" (ie. make the potions fast), the game gets way harder - cause the next one come sooner, so you go through more per night, and since each one is faster and faster then it gets crazy fast by the end! Dunno if that's intentional.
After the first couple nights I switched to finishing each potion at the latest point possible and it felt like it got way easier.
Overall, great work :)
Edit : Also each ingredients "hitbox" is a bit too short. If you click the top 1/4 of any ingredient, you are clearly clicking it but it won't register.