Llamada terrorifica broma: Sca

This application performs a call simulation, you can program a delay in it. When the device rings it gives you the option to accept and reject, the two buttons accept the call. In order to exit you have to press the correct number of bones, between 0 and 6 to be able to end the call.
It is version 1.0, I would like to know your opinions. The application is made in Spanish since I see that all that exist are in English.