Hi, nice game you have here. It would be interesting to know exactly what influences the # of customers per day, as I failed to myself. Regardless, it was still a really fun waste of time. Please keep making these games, we need more developers like you in the world. Are there any drawbacks to maxing the coffee quality value?
Note: You can exploit workers for their labor by cranking their stats up before the day, but dropping them back down at the end of the day before they collect their paycheck, paying them only minimum wage for their doctorates degree in coffee making and customer service.