I did not get far with this at all. It sounded interesting from the blurb, but it was worst person voice and I usually find that annoying. I find it particularly annoying when it's happening in real time and the narrator's voice doesn't remotely reflect the terror of enduring a life-or-death experience, as this one failed dismally when Nadya fell from the airship and went plummeting down through the clouds - and her narrating voice remained unchanged! Worse, her description of it was boring!
The most serious problem here was not that Nadya actually had a sky-lung and was stupidly named after it, but that there's no suspense here whatsoever. By definition, there cannot be in first person stories because this girl is narrating the story - what, are they going to stop it 15% in because she died unexpectedly? No! I stopped it at 15% in though, because I couldn't take it seriously. I wasn't openly laughing at it, but it was a close-run thing. Gone is your immediacy. It was sad because the world the author had been building was moderately interesting, but the voice was just not getting me to suspend my disbelief, so I suspended my listening to it instead. I can't commend it based on this experience.