For multiple orders, to save screen space and let player focus, you could have the "inactive" orders smaller but still visible, and allow the player to switch which is the active order by dragging them, perhaps something like a carousel wheel, vertical or horizontal (whichever has more room)
Or you could have the orders instead be in a stack, and let the player pick one off the top and place it wherever they want on screen, this would allow the player to drag as many or as little orders as they want out at a time, and put it where they want, allowing more player freedom. They would obviously animate out once completed, and whenever you make a burger it just either automatically detects which order it belongs to and completes it,
OR you could have the player drag the burger to the order receipt like a game of charades (not sure if that works gameplay wise and could be too complex for the player but interesting idea)
I personally like the second Idea because it gives the player control and makes the experience more interactive and they can still play at their own pace, whether it be slow or fast.
The assets are just on point for this game, the game as a game is very game, very complete and well designed game.