This is probably my first submission in 3 or 4 years. This is the second mystical ninja submission, and it's got a similar pattern.
In the original game "Mystical Ninjas" for Nintendo 64 Oedo Castle has transformed. The ninja's rush in to save the day. The closer you get to the boss the more intense the music became in the game, that's why I gradually add more intensity as time goes on. The same is true for pretty much all mystical ninja songs.