I like the ideas and I honestly don't mind the key switch too much, I'd just try to find a way to make it blend a bit better. Maybe instead of having the first part in the beginning being start as an intro, you could expand it a bit to give the track more direction. Otherwise, I don't mind the switch too much. It doesn't kill the atmosphere. I really like the guitar arp you used. Perhaps you could double it with a rhythm guitar just before the "drop" [1]