I quite enjoyed the concept here, took me a few tries to figure the game out. Some little bits I didn't quite realise at the start is how you can pick up two drinks at once, what's the condition for the clear bar (it's not having any leftover drinks by the way) and that the brew bonuses from previous rounds are actually permanent (I originally thought they are for the one day only). After I figured this out, things started to get smoother as I started optimising my gameplay more and more.
I feel like the brewing ingredients could use some balancing. For example, for $10 herbs giving higher tips you need to be given $2000 worth of base tips ($2010 total) for it to pay for itself. Also, the species-specific bonuses increasing DoT had a price barely more efficient for its specific species and didn't affect others. So in the end, I kept spending my money on Transylvania GNS, because it would take over 10 levels before the money bonuses would pay for themselves, and most problems didn't come from serving speed but the bar being occupied.
When it comes to the bartending phase, I'd suggest making annoyance bar background different from the drunkedness bar, so it's easier to tell whether someone is increasingly annoyed or increasingly drunk. Also, I noticed that the drunkedness bar is drawn higher than the annoyance bar. I feel it should be the other way round - knowing that the customer is getting more annoyed is more crucial for the player, so it's best if annoyance is what sticks out to the player. An auditory feedback (like an annoyed grunt or growl or something) when a customer is halfway annoyed would also help.
Also, it would be nice if the customer paused their annoyance when they're heading to the next free position (rather than wondering around an waiting for a spot to free up). Otherwise, an unlucky player might end up with a situation where the customer briefly enters annoyed, and then goes to the furthest possible spots so before you have any chance to give them the drink, they're already furious.
There are quite a few of the suggestions, but it's not because the game is bad, but rather because it could be made even better with a few tweaks. The game generally has been enjoyable, the artwork was nice and detailed and the music fit as well. Well done! ^^