Nice job, this is a fun idea! I think you could argue that the beer is the key item in this case =) The music and art is really nice, though the tables don't quite fit the style of the rest of the game? Probably just because the scale is smaller.
It's a simple loop but pretty satisfying. I think if you had more time to add some more subtle touches, like mugs being left on the table, would be really cool too. Maybe night gets harder cause you have to bus the mugs back to the wash? Upgrades are nice as well, I see a lot of potential if you want to expand it!