You have managed to conduct a Sith ritual to make Ahsoka into your slave. However, her will was too strong and you aren't able to fully control her. The game revolves around 2 part day cycle morning and night in the morning you can send Ahsoka to gain credits that you could use to buy new items and maybe even corrupt her.
In order for you to be able to install this game, you need to enable (allow) installation of applications from unknown sources (Unknown sources) in the phone settings. Usually this item is in the Security section