interesting game. I am very impressive you can have a great game design as your first game. my first game is not as great as your game design. you can improve further by providing a small in-game tutorial or instruction text. I thought I have to press the space key against the customer when he/she is trying to order food like the way I need to lead them to the table. I guess more consistent approach to take waiting customer order, take food order, and etc can make the game more intuitive.
I current have one duck hunt game in progress:
https://nykevinwong.itch.io/feather-hunter
I also created a 2d platformer game early.