Thanks to asking Namiki a few months ago, here's a breakdown on who did what. Track titles are based on
this playlist, and honestly they're probably not the best titles, but ah well.
Namiki: Title*, Character Select, Stage 1, Stage 2*, Event 2, Event 4, Stage 5, Ending 1, jingles (not in the playlist)
Kaneda: Event 0, Event 1, Stage 3**, Event 3, Stage 4*, Ending 2, Ending 3* (also not in the playlist)
*Also confirmed on
Basiscape's music preview page.
**Kimihiro Abe told Chimeratio that he composed this one. However, Namiki said it's by Kaneda, and Abe is not in the credits, so maybe Abe is just misremembering. Personally it sounds a bit more like Kaneda to me.