Thought I made a note about the artists when I added this, but apparently not!
The only credit on the soundtrack is to SOLIDTUNE, but both
the staff roll and
SOLIDTUNE's page for the album list the full staff. However, I'm not certain that anyone besides Seiichi Takamoto was actually part of SOLIDTUNE and not just working through them in some way. In particular, Kei/Keita Tsuda seems to have been still part of noisycroak at the same time several of his SOLIDTUNE works came out.
I also just noticed that Ron J. Ward isn't credited on the site... I'm fairly certain he used to be. He's in the game and has retweeted videos of its music before.