I definitely enjoyed the atmosphere throughout the song, and well, I definitely didn't expect the metal at around halfway in. In fact, I think the two sections are completely different to one another, as if they were two separate songs mashed in one track. While the atmospheric intro, with orchestral instruments and a very good, expressive poetic tone sets the path for a greater crescendo of atmosphere, it suddenly gets slammed by an uncertain "metal" part which in my eyes doesn't quite stand up to the former section, in terms of expression and feeling. Technically, the first section of the song - which I think it was probably intended as an intro of sorts - takes exactly half of the piece, the latter section which implies more action and a more upbeat atmosphere feels rather short in its resolution, as if it didn't find enough space to breathe a life on its own, and I find its mastering a bit quirky, from the pounding drums with a reverb or delay effect that borders the annoying, to the guitars that are not as powerful as the drums, to the robotic/vocoder-filled vocals that I think are quite out of context in this whole deal.
Overall, while I find some ideas to be good and well executed, some others feel rather unpolished or need some extra attention. Best of luck with the contest.