Great work on a summer job. Excellent core gameplay loop that reminds me of the diner dash type of game. I ran into some game-breaking bugs where if i was already carrying something, then someone places their order, the notepad would "overwrite" the delivery of the order. Then, even if i tried to bring the notepad to the chef, the original object could not be delivered. I think some type of dash mechanic would be good to speed up the gameplay. Also, instead of a timer/coroutine to take orders, make it my responsibility to check on the tables.
I loved the little arcade cabinets with the built-in flappy bird! Great work with the minigame and the overall feel for this game.
Congratulations on submitting!