The idea of the game is nice. The music is well done — simple, pleasant, and it really feels like restaurant music. The visual style is also quite good. For a first jam, it’s very solid.
As for areas that could be improved: I would have liked to have the option to burn the food. Even if you miss the green zone, the food is still accepted. Making the green zone appear randomly while cooking could add more dynamism to the gameplay. Of course, different types of dishes could be added as well, and time-based mechanics could also be introduced.