Interesting summation. There could be Satanic references. But that could be because the life they were referencing had evil influence.
Whatever the case...the "guitar battle" was great.
And it's not like the dark influences were portrayed as good. It was very much a warning. Don't get caught up in this, because it can be a trap and you might very well not find your way out.
Some Christians might beg to differ, but there's a lot of truth to that.