Gotta start with saying, "Great mix, I'll listen to it once a day." The constant transitions between the two songs really make it sound like a battle of good and evil.
But one thing bothers me. The first quote in the remix comments says that the main character and the final villian were once allies, but they weren't. Julius (the final villian) was an ally of Dark Lord since the beginning of the game, and Dark Lord keeps the main character as a slave to fight monsters for his own amusement.
Also, FFA had 3 battle themes, Fight 1, Fight 2, and the Final Battle. This remix is of Mission of Mana, and Fight 2. But since the final showdown is 3 consecutive battles each with different music, I can't complain.