Aoris's last song was released as part of the anonymous song competition on niconico douga where entry songs were anonymously uploaded to a dedicated channel, with strictly black and white, minimally animated text PVs. The intent was to "let everyone make the kind of music they really want to make". I can detect elements of that song in this one.
Here's that song, if you're interested:
The lyrics are a bit hiiragi magnetite-y, which was most people's initial guess as to who made it.