Thank you so much! We are very glad you had fun and enjoyed it!
The music was made in an attempt to represent both couples, so the first one is a mash up of Alice's Romantic Children and Marisa's Magus Night, hence the name Romantic Magus, while the second one is a mashups of Sekibanki's DDC theme and Kogasa's UFO theme.
The protagonist couple's theme was made attempting to intertwine their motifs together, and even playing at the same time during parts of the song, in an attempt to indicate that they are really in synch and working together as a couple. Meanwhile, for the antagonist couple's mash up, I avoided to overlap their motifs in an attempt to indicate that maybe they aren't as synchronized as Sekibanki and Kogasa, and they are merely fighting alongside each other, and not necessarily fully together as a couple.
All of this to try and empower the protagonist's through the music and make them feel stronger as a couple than Alice and Marisa in the triumphant finale. And I'll take you recognizing it as just Marisa's theme as a success!