This is a Doujin arranged album of Espgaluda by one of the original composers himself plus some original works, and is
available for free. My guess of the track origins is as follows, but I'm not so terribly confident of this so please correct me if it's wrong.
01, 11: "Huge Battleship Elinies" (?)
02, 06: "Floating Castle Utsurobune"
03: "Different Blood ~ Wearing Blood"
04, 08: "Secret Power"
5: "Different Blood ~ Wearing Blood", "Ravine", "Huge Battleship Elinies" and "Fort City"
07: "Tremendous Pressure" (?)
Now I can count 7 tracks,
SOU1 lists himself as the only composer of this album, and
he also explicitly says his compositions were 7 tracks in total on his website, I think it's nearly safe to give him credits for these tracks.
On a side note, I really hope he'll return to score another shmup game. As much as I like Namiki, the original Espagaluda soundtrack is also good.