First of all, THANK YOU for not using any sort of percussion on the track. I feel they would have ruined the atmosphere, making the song feel like another pop hit. Instead, I think it was smart of you to keep it drumless. It's more powerful this way. The gated square synths you used already provide enough of a rhythmic reference point.
So, technical wankery aside, I really don't have much to add to what's already been stated down below. 7 minutes, wow. Didn't feel it was that long. It's as smooth as future elevator music can get, in terms of pacing and easy listening. The intended dissonance between the dark lyrics and art pop-like bonanza makes it really endearing to me.
It's like one of those anime with a bubblegum mainstream exterior to lure any potential viewer into thinking they're going to watch just another mindless lighthearted show, but it's actually really dark and twisted (looking at you, Madoka), which makes your song all the more genuine and at the same time sophisticated, to me.
It's easily one of your best works to date and I'm glad to have had a chance to witness its production. Thank you for sharing this with me, please keep it up.