The point of the game of Tiny Death Star is to build as many levels as you can. There are 3 major type of levels like Imperial, Residential, and Commerical Levels.  There are spieces from all over the galaxy who work and rest in your Death Star called Bitizens . Traitors in the game will sneak in death star called spies. Catch them and get Bux for a reward. The more levels you build the more credits you must pay.

Special bitizens come your death star are called VIPs. They special abilities. There are in app purchases like Bux .
Imperial Museum

a commercial level