I completely forgot about this, sorry about being so late with adding credits. I've added most of them except for the symphonic stuff and disc 8, if anyone wants to help with those it would be great.
About 変移空間のオクテット, it's a
spin-off subtitle, and I don't think we usually translate game titles unless there's an official translation.
I would use the romaji version of it, or maybe Steins;Gate 8bit since I see it's referred as that on some albums here.
Or if we still want to translate it, I think I've seen it as "Variant Space Octet" the most, so maybe that's an idea.