Nice relaxing game!
I had a similar UI bug where the cafe was smaller in the top left and the menu items were on the bottom right.
Suggestions:
Make the Upgrade and Cafes button functional, at least to a level where it tells you the feature is not implemented so you know it's not a bug.
The customers should leave after some time.
The customers should increase the cat's comfort when interacting with them, unless it's a kid or something where it makes the cat need you to increase their comfort after interacting.
Customers should be able to adopt the cats from the cafe. Maybe a bonus to adopt chance on receiving a cat interaction.
Periodically refresh cats available to bring in to the cafe.
Great work, I had fun!
