Were there any sections in any of the tracks you found to be particularly difficult or complicated? If so, how did you work through the difficulties?
Gladly, there weren't any real difficulties or complications at all, mostly due to the fact that communication with the dev team was excellent and we worked through quite a few references before I presented the first layouts. Also, the artwork already gave me a good clue which direction to take with the music and sound design. It was all wrapped up over the course of a week or so.
The only track that required a minor revision was the main gameplay track, "Gremlin Polka" - it needed some more "fantasy" elements than I had originally planned, but it was as simple as adding a few cymbal and timpani rolls and adjusting the strings a bit.