There are different endings (3 to be specific), kinda. but there are multiple different reactions the person can give depending what you do. So yes, there is a way to make "the perfect cocoa", which I call the "pretty good" ending. But it's pretty similar to the neutral ending, as making the perfect cocoa is subjective to each person, so the good ending in this game is just how I personally make a good cocoa lol.
But thank you! I'm so glad to hear this and see such interest in this game ^^ I can't promise anything major expect small update to enable mobile version, but it sounds like a fun idea to expand this cocoa critic and their story.