"Master" comments on the Altered Beast soundtrack on G.S.M. Sega 1, and that's a confirmed alias of his through the Galaxy Force II/Thunder Blade album. I don't know if he composed the whole thing though.
"Nau" is a common mistranscription of the Genesis credits. It's actually "Nav" (compare it with the U in "sound," the bottom-left corner is clipped), who is
Kazuhiko Nagai.