It keeps things fresh, practicing in other styles.
It gets kinda repetitive in the later half.
Try making some background notes of varying tones and pitch with an echo format. Experiment with that, Risk of Rain has a feeling of grandness to it. Basically a saga visualised through the gameplay. And the music always makes it feel its bigger than it is.
Constantly rising in intensity with minute pauses here and there to give the songs space to breathe.
They all also have a hook that they share you know the one.