Music is great!
I love the music AI.

Devs can add some more themes and scripts to add awesomeness to the game though.

Maybe slightly modify themes while you approach enemy base.
The more you go in their territory the more mysterious or fearful music can be.

You can also slightly vary theme when farming neutral (harder and trickier i admit).
While peacifully drinking fountain water also.

Also you can propose differents versions of thoses themes for Radiant and Dire.

Those are just ideas thrown in the air.