Great work! I felt the stress immediately! It's a lot of fun already and you could definitely take this idea a few directions. Some quick thoughts:
- I think overall your point about repetition being a fear will make designing this game really fun. The mechanics are great, and you could have a blast adding variety to this. Are there drunk patrons that you want to avoid serving? Are there animations or bonuses for serving a streak of five customers (he's on fire - nba jam)? Does someone get a promotion at work and buy a round for every customer at the bar?
- The overcooked "how many orders can you fulfill" was the first place I went for 'goal'. But you could add values to different drinks or patrons to spice that up (if a group shows up, they order three drinks at once, but you get more points if you pull it off).
- It forgot who did what. Eventually cashier = money = green made sense, so maybe each worker having a different colour shirt would help (if this a broader issue)
- Maybe more visual emphasis (e.g. bigger animations) on the actions besides progress bars would help the player keep track of what actions were happening, and when the action has ended.
- After I got the hang of it, I wanted the workers to switch tiles faster.
I hope you keep exploring it!