If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Build your tower to the skies and make money with help of your citizens. There are 2 types of floors in the game: residential (where your citizens live) and commercial (where they work at). When a residential floor is built, you can lift up a new tenant there. Then you may employ him at a commercial floor where he'll be able to produce various goods. When production is over, just hit the Start Sales button to begin earning money!