First off, very interesting lyrics indeed - the Jekyll & Hyde theme is clever and sets up the changes in perspective - you, she, I, your very own - and of course the mirror - so quite enigmatic as to who is who (and who is you and I am he and we are altogether...
).
I think the instrumentation is well chosen and supports the off-balance feeling. The little details like the Spanishy guitars and the backwards stuff (how does one do that?) were good. From about 2'20 to the end I think you could go super-heavy in the chorus with more guitars and more distortion to contrast with the more narrative verses. Could be interesting to try?
I'd say the vocal in the chorus slightly "thin" - I see what you tried to do with the octave. I wonder if possibly just a straight double track might workto make it rounder? Or an octave below to give a bit of grit?
Anyhow, a really creative and moody piece and this is just fine tuning really.