Hello There!
Greetings from S.I.S Technologies!
Hope this finds you well. I had gone through your application(Facecrypt). i believe at the very first we need to make some changes in UI. Also, As I had used this application, it lack in proper alignment.
Also, I don't know why but many a times it automatically crash. Might be needed to be upgraded. Also, IT NEEDED TO BE UPGRADED TO iOS9.
As far additional features are required, we can give stealth mode, pop-up notification with password, Pop-up for icon. ETC. This are among the trending features.
Kindly, share complete requirements, once we will have all the requirements, we can suggest you better.
Regards,
Sufiyan Rao.