I suggest to add more colors to the UI for the best choice and experience, more personalization of the device, making it more personal, like adding oragne,red,gray,white and others.
The a little fix for the app lock : it works well but it shows for a sec the contents behind the app lock fix it and the software is almost perfect.
And for finishing a toggle in the notification bar to block the device , just tap and block, without double tapping everytime, in this way the power button lasts longer.
Hope those little ideals are good for a better looking UI.
