If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this game you are working in a Chinese MacDonald's restaurant. The clients will come and order things. The things they want will be displayed in bubbles above their heads. You have all these things behind you (in the top part of the screen). Once you complete an order, a satisfied customer leaves. If it takes you too long, the client may get angry and leave spoiling your reputation.
Arrow Keys - Move.
Spacebar - Action.