Very chill and relaxing. No stress from angry customers is nice. Beautiful pixel art and the juxtaposition of a coffee bar in a fantasy setting is fun.
I think you could simplify the UI by having the preparation countertop "Down" from the customer view and don't worry about the shelf space at all.
The fun comes from interacting with the machines and working through the queue of requests, but fiddling with where to put things and lots of clicks to pick up put down / arrange items feels more like friction or a distraction from the fun. If there were a mechanic that required the counter to be cleared or cleaned frequently, I can understand the shelving a little more, but I would rather see you double down on the machines and recipes if you were to refine the game further.
It wasn't obvious to me (even after reading the directions) that I needed to go "up" from the customers twice to find the area to make the drinks, I kept trying to bring them down and wasn't sure why nothing would combine. This could be in part from playing Potion Craft where each screen was only one move up / down / left / right from the main screen and assuming this was similar. Another factor is probably the assumption of the order of the physical space that customers would be above the prep space, even if the storage space were above the customers.
Noted the BG music wasn't composed, but the choice fit the game well.