Nice concept for a simulation game! Love how you guys decided to incorporate Bae’s love for Coffee, and inside jokes for the customer names LOL!
Since this is early in development, I think you guys have an abundance of options of directions to take the game. Since there is no real end condition or goal, you guys probably can discuss the overall goal of game. Maybe adding some score, time attack to make as many drinks, adding more things as the day goes on, a VN-styled chilled experience that focuses on a story like ζοιδ mentioned.
…And the self-implode button. A little more instruction on that LOL (I clicked it out of curiosity, and was confused why my game ended abruptly XD)