Oh no! Is the employee walking to the machine to collect the coins after the machine is empty? I designed it to only give coins when the machine is empty and the employees collect them but to give happiness each time the machine is played. Please let me know if this isn't working for you and I will see if I can fix it.
I wanted to give less tutorial so people could get right into the game, but I may add this to help clarify in the future. Maybe creating a mini manual in the menu would be helpful. Thank you for playing and giving feedback! :)