Really loved the game and idea. I did something similar for my game where you are serving customers! I loved the idea of snowmen drinking hot drinks haha.
I did have a hard time understanding the controls. I was able to I think take orders are the registered and I think work the grinder at the back but I couldn't really figure out how to make drinks.
Over all I liked the idea but some type of tutorial phase or UX to help guide the user in what they are able to do would help!