Furukawa did compose (I think he did the track he arranged), lists the game on his site as composed.
Miyawaki says she did mid-demo and staff roll (at least).
Maezawa talks about S.E. and voices, but I don't think he explicitely says he didn't compose. He lists the game on his
site (as works, doesn't specify if he composed)
A. Hashimoto wasn't in the booklet nor mentioned. He has composed in other games though (ex. Asterix).
Guess we still don't know. Oh well.