This game reminds me the game Cafe "Sliding Plates" that is also here on newgrounds, but is rather... worse than that one. It's a bit unbalanced. The scenario is: some customers, some customers, insanely massive amount of customers. Some of the parts seem to be impossible to pass without a power up. For example: how to serve that big guy and catch the falling glass exactly in the moment when he does his fireball belch?
Collecting money is not that useful as it should be. Maybe some upgrade system? More unlockable heroes? With more abilities that actually affect the gameplay? For example a hero that can serve 2 smoothies at a time?
It would be a good idea to expand this game a bit.