Simple concept, simple art - but a good core gameplay loop. I'd like to see some sort of visible time pressure on the player. The controls were intuitive and easy to grasp.
More distinct colours to make it more obvious when the machine malfunctioned would be good. Also, my first 3 customers all wanted latte - I'm not sure if that was intended, but since I had 6 things to make and only had to use one, it might've been nice to ensure you get variety in the first couple of orders.
Well done!