I would love a free-cook mode where you can cook anything and send people certain foods (sweet, juicy, etc.) and earn money for cosmetics. You should add new food and you have to order skewers and/or food. I will post here with more ideas as they come, if you don't mind.
Yeah, this is exactly what I thought after I played the game. Maybe as you play you gain the ability to use different utensils, how you cook the food, and different foods you can use. The idea of you serving food on the train, and thus meeting many different types of people is great! Loved the atmosphere, and would love to see the background out the train windows change as you travel.