Brightness and Volume should be draggable.
Mute doesn't mute everything. That's a killer because I need to mute my tablet in my classes, and hearing the chime is unacceptable.
Flight mode should turn off WiFi and Bluetooth (and possibly GPS). I don't know if it's just mine or something, but when I turn on flight mode it just makes it so I am not connected to wifi and bluetooth is 'off', but the modules are still in memory.
The volume mute button is very, very difficult to press. You should also have it so that until you unmute it, you can't move the audio bar, because when I'm trying to hit mute, i might hit it once and then one more time, and I missed, so it unmutes it since it's so easy to hit the volume bar.
advanced backlight used dpad center as a mute. i wonder if the same can be done here.
Perhaps the WiFi box should show the network you are connected to. Having the... UUID... looking thing isn't very useful at all.
Perhaps put GPS coordinates in the GPS box? Or put GPS and the green dot into one box. It is hard to tell what box does what. You can probably just extend the box into a bigger space so it's one big box or just leave it blank till you figure out something to fill it with