Great Idea
It plays well, and can be fun. But there are a few flaws to it that hold back the game from becoming what it could be. First off, the "Order Complete" pop-up gets annoying after every order you finish. Just make one comunitive Order Complete at the end of each day. the helpers were nice, but completely useless untill you fully upgrade them. Which it took me about five or six days to figure out how to upgrade anything at all. I think that their should be a helper at each station, keep the two where they are now, and eventually make the whole game autonomous. I disliked that I couldn't leave the delivery desk while someone was coming to pickup/leave money, which also slowed the game down on top of the constant "Order Complete". I've also run into a bug at Day 13, I've just taken an order and now I can't click on anything.
Add in more upgrades, make the game look a little more prettyer and adjust the pices for upgrades a little (make them more expensive and increase how much money you make a little bit), make the customers start coming in faster and you've got yourself a hit game.