Thanks a bunch for credits, CHz! If Nobuyuki Akena worked in the game, so Akezou Akena can only be him.
But I'm still in doubt who are the composers, since the game credits don't specify. Maybe just reading the liner notes as you said. According to GMCL,
Yukie Morimoto composed for Pop'n Twinbee, but apparently
Harumi Ueko and
Michiru Yamane didn't composed for this game. I don't know if is better for now just credits as Konami Kukeiha Club until we have confirmation.