Got credits from here.

I added a larger image of the disc for this one.

I added a few more composer credits based on information from this album:

https://vgmdb.net/album/6228

I'm still not sure about M12, 18, and 19. Though M12 is from the game Mizuiro, which the album linked above says was composed by Riverside Music, Ebi, and Nakachan. However, this page for the Mizuiro Soundtrack...

https://vgmdb.net/album/2456

...says that the music is by Noriyasu Agematsu and Takehiro Kawabe, so I think something is incorrect somewhere.

Track 5 on this disc, 石切, is actually from [-Aka-], not Giniro. It's track 2.03 on this soundtrack: https://vgmdb.net/album/83

The composer is feel, according to the credits for that album. Both the page you linked and the credits for the Neko Sound Collection (which I linked in a previous post), have it as a track from Giniro. I'm not sure why. There's no track called 石切 on the Giniro soundtrack.