Starts off pretty good, but begins to drag.
First off, the design is fine, though I felt the audio was a bit sparse.
The story started off fairly interesting as I got to learn about the hero's childhood, but after about level 5 it started to feel less clear and interesting. While I had feelings of the state of apparent despair in the hero, it was no longer a clear narrative. I really felt that I lost a lot of connection and rapport with the hero as he drifted towards despair and perhaps a bit of feeling that the world is meaningless.
As for the gameplay, it was okay. The exploration and platforming was alright, but I felt that flight was rather clunky. Unless you have a directional gust, your character moves very slowly, and the fact that "flap" and "glide" are mapped on the same keys made parts of the game very frustrating and unnecessarily difficult. To elaborate, there were parts where I desired to glide in order to slow my descent, yet doing so forced me to spend my precious stamina. The worst parts were when I was limited in the amount of height I could achieve thanks to a low ceiling, forcing me to only shortly tap the space bar, which made it completely impossible to glide. Simply put, when I first found my wings I found it delightful to take to the skies, but the slow pace, the extremely limited stamina, and the inability to glide without flapping drained that.
Overall it's a good experience and even has some emotional impact, but it overstays its welcome thanks to its loss of a narrative and gameplay which stays just a bit too slow.