Since I'm like the only one who beat the game (and no one appreciate my love and passion for the game either, and if I drew Curly Brace fanart, no one would notice anyway...), I'll comment on your tunes.
Balrog: I'm not sure if trumpets are good enough for this song. The original felt more playful. >v<
Eyes Of Flame: The church singing doesn't stick out as much as the original, but the rest of the instruments are good.
Jenka: This one sounds close to the original. Good work on it. The end-parts has neat beat-boxing. ^^
Moonsong: It needs more flutes and/or violins. The main instrument sounds like an organ, and it doesn't have the same feeling as the original.
Running Hell: Very upbeat. ^^ It really kicks in after a couple of seconds~
Tyrant: This is funky. But it takes a while to recognize the song and feel attached to it.
tl;dr: Good work on radmixing them. I like the original tunes though. o.o