It's quite cute simple game. I enjoyed unlocking new lewd recipes and creativity of there effects.
But in the end it's just "follow the recipe" game. I think it's a bit of wasted potential.
I want to experiment. I want to feel like alchemist.
But I perfectly understand it's really hard to make a good game mechanics to express this feeling.
Still I enjoy every moment of playing 

The music at the start is low and the rain sfx is too loud and sudden!
Mortiana sometimes repeats lines two times, like "Passable. For a first attempt." and "My laboratory is not pigsty, clean it.".
If you fail 3 times the game gets bugged,
When you win the pure recipes route, she gives you a choice "Freedom or Eternal Servitude", but we just keep playing like normal.
During the lewd scenes, you can hover over the invisible UI.
Actually giving away the answer to the the lewd scenes makes it the same as the normal recipes (boring), but with a reward. I think the solution would be making the process of making mistakes more enjoyable, but it would clash with the mean personality of your Master.
I would suggest introducing a new character that would help you test recipes safetly to unlock the lewd scenes.
Like giving only one possible ingredient of the two and you have to guess.
Neco fate reference is peak.
I find it conflicting that an evil witch like this would just let you play pranks with her with zero consequences, at the very least, I would expect her to slide to the MC position, play bonk sound effect with stars and threaten that she will do something horrible similar to what just happened to her, but instead to you later.
The AI voice is cool.
The game strongest point is the comedy, good job!

Bang on the money for the theme. Stirring the pot took me a minute, but after that it was pure flowing ^^ a dash of hornyness, a teaspoon of bizarre comedy, loved it and would love to see more <3