Controls are awkward and unresponsive. Why did you include water if it is no different than dirt? A decent start, but it needs a lot more game to be worth playing.
Why did you put your logo that links to another page in the lower right? It obscures upcoming threats and is far to easy to accidentally click on. Terrible idea.
There is nothing new or interesting to make this game stand out from all the others of this type. Also, toilets are not nearly as funny as you seem to think.
Nicely done and it made me hungry for a burger. :)
It does get repetitive, though. Perhaps star customers could order "the usual" instead of one ingredient at a time. A few other products such as shakes and sides might add variety. Also, it would be nice to hire some help. Finally, my rank should give some sort of benefit.