Hey, I love that ending, with the frenzied little drum bit in the coda. And the spirit of the lyric is awesome, big big points for using "putrify" and even rhyming it.
Otherwise, trying to make sense of my own listening reactions...
This kind of goes on in, as you say, a grumbly way that is recognizably melodic but doesn't really sound it. I think it might work better sung higher up. Or as a duet with Lady Gaga. I want to hear that melody because I know it's there.
Looking forward to future developments.