The music score is incredible. Provided you care for ambient and electronic, I'd encourage checking the series out just for that.
VFX is quite catchy. That's MADHOUSE for you. It goes well with the sound.
As for other aspects, well. The show touches upon a lot of themes, but ends up feeling shallow, failing to develop them into something meaningful. Here actually the deep OST makes it all the more prevalent.
Like most shows of its kind, in the end, the viewer is left with a bittersweet feeling of untapped potential. It could've been an experimental marvel, reminding us of Lain in a way. It certainly did for the 1st episode. But only this far.
Alas, it's just a nice show.