Nice premise, nice graphics, but the fact that the number setup on the screen is the mirror of the one on most keyboards is kinda distracting.
Oh look another serve the customer game... <retch>
This type of game has been done far too many times. The use of number keys instead of just clicking was a new change, but proved to be more annoying than functional. In addition, the text for the instructions was painfully difficult to read. The only real highlight of the game was the music, which fit the feel of a store. In short, this proves why I never wanted to be a cashier.