Excellent entry! Nailed the theme and the atmosphere. The book felt very polished, but I do think it would have been nice to be able to pin the ingredients / ritual instructions to the UI.
Mixing was a fun mechanic, although I think it would be better to click the ingredient tab to open it, rather than it automatically opening when you hover over it. There were a few times I accidentally clicked the top ingredient because of this.
Having a few more items to pick up would help make exploration feel more worthwhile. Currently it feels like it's only really there to avoid softlock. Otherwise, sleeping and checking the shop the next day always felt like the better option.
The camera felt a bit jittery, although that could just be the web version.
I really liked the characters, all the customers and demons had unique personalities. The character interactions had a lot of charm to them.
I enjoyed the summoning rituals too. Getting feedback for each step helped both the atmosphere of the game and the player quality of life.
Overall I'm very impressed, all my critiques are minor quality of life suggestions. I enjoyed playing it enough to finish the game. I think there's a lot of potential here, great job! :)