Overall, pretty good, but the cut to the power lines, followed by that weird almost subliminal "Protection Leader" frame ??? What's that about? It spoils the flow. If it's somehow meant to symbolise the "outside world" I think it'd be better to shift it to the very beginning to show Luzi leaving it behind. If it's meant to indicate that she's still tenuously in contact with the "outside world" ... well, that's implied by her holding the letter.
Also: a small detail, but one that really bothered me - why is her name and address handwritten on the outside of the envelope, and the sender's name (and the subject of the letter) appear in the address window. This kind of
whaaaaat? 
thing distracts me from what follows, as it's so completely detached from reality, it makes me think it must be part of a plot twist ... and when it isn't, I'm distracted by wondering why not!
Overall, the camerawork and editing of the dance sequence was good, but

DON'T FORGET THE FEET! Dance is nothing without footwork, and if you include shots of head, hands or torso, it's important to include at least a few shots of the feet as well.