Throughout the series, AC has been taking cues from either it's own tracks or from other media as well.
Here's what I found so far:
Final Option sounds like a remix of Lifeline
Megafloat sounds similar to Aerial Hawk
Arcade Knock You Down sounds like a remix of Elemental Particle
But here's something interesting, Alect Squadron/Armada's theme sounds like a modernised, sped up version of At Doom's Gate
Can you find any more similarities?