The Hamburger

I got the first part-time job for the hamburger shop!
At lunch time it's much more than full! I have to make a lot of hamburgers entirely and supply customers!
Customers would get furious if I make incomplete one, and I must get fired!

[How to play]
Tap on screen in order to drop lettuce, meat, and so on on buns carried on a conveyer. Game over if you fail to put any materials on buns.
Watch out, the speed of conveyer increase gradually.