I've only seen the first episode so far, but I find it meh. The story is okay but it so far just seems like a fairly conventional sci fi anime, it lacks a lot of the trippy visual elements that made the first one so fun and bizarre. Story wise it also seems to be playing it a bit safe too, just a standard "lonely bored character has her world shaken up by the arrival of some crazy new person" story. The first one was not just notable because of its visuals, it was the amount of depth it was able to squeeze into a 6 episode series. It's a great story about adolescence.
That said though I've only seen the first episode, I'll try to reserve judgement until I've seen the whole thing, but I kind of suspect I'll be disappointed. A lot of times when a sequel gets made a decade or more after the fact it's hard to find the same groove again, and I suspect that's what's happening here.
I like that they got The Pillows back to do the music again at least.