Great wee game but there is some tweaks required before it could become one of those highly addictive games. A few improvements would be:
1: Allow the waitress to serve 2 items at a time to customers, as well as being able to hold up to 2 dishes for washing on both arms.
2: Be able to buy an upgrade that allows the customers to be patient for longer
3: She starts going glitchy when you line up loads of commands. Literally she would keep going back & forth on the same spot until she decided to go to the destination required.
4: Have more upgrades in general to purchase, it's too easy to buy all the upgrades. Once you have everything it does start to become quite monotonous to play as you're not really advancing anything but your score.
Just a few inputs, hope they help.