I really like the intro. Subdued and creepy. Interesting build up... I like the phase/chop effect. Scream at :50 is nice.
I really like how the track is building. Breakdown at 1:20... solid. Weird pianos coming in.
Not a fan of the harmonica. Maybe it if were more detuned from everything else? Or maybe this is the effect you want...
Okay by 2:10 the harmonica is pretty cool... but I don't feel it goes with the beginning of the song. Maybe that's just me. 2:30 is nice and menacing again. Fighting with the harmonica is interesting. 3:00 feels slightly repetitive, but maybe only because the song has been so active until now. Nice at 3:26 with the bass dropping in. 3:35 drums are great. Harmonica seems out of place entirely by now to me. Breakdown-outro is cool. I thought the ending worked well with the song.
I don't know... it's a very well-put together song. The harmonica issue just might be my personal preference—maybe others will really dig it. I think it might be worthwhile to cut a second version with the harmonica replaced with something else, just to see how it fits. Otherwise, I don't have much I find wrong with the song. I also might do a little more with the scream vocals at the end... but I dunno maybe that's just nitpicky.