As someone who likes to cook, the gameplay itself is actually pretty fun. Unfortunately, I wasn't able to complete a single order after the tutorial, because I kept running out of time. I would either speed up the player's movement and cooking time, or make the customers just a bit more patient. There were also times when I accidentally placed two ingredients into a single dish, and I was unable to separate them (although this may be intentional). Lastly, I'd recommend pausing the game when the player opens the cookbook, so that the player doesn't waste time while reading the recipe.
I really do think this could be a fun game if you fixed it up a bit.