The only thing I can see wrong with this is the ending itself. The whole song (in my interpretation) illustrates the feel of a decaying city, but still showing that the explorer is breaking the wall of anxiety with healthy dose of bravery and conviction, and so the positive parts fit really well. This is why the theme switches focus from the explorer to the ruins themselves.
As every art, it is open to interpretation, and I am liking the way you made this. Keep up the good work please!