Gunmetal has a very good soundtrack, too bad I can't figure out the game's files, nor would anyone else have a clue either given how unknown this game is.
And before you say anything I mean Gunmetal by Mad Genius Software. Note there is no space in the name "Gunmetal", this is totally unrelated to the Thexder ripoff "Gun Metal", note the space between "Gun" and "Metal" and note how the two words are capitalized and are indeed two separate words.