The SMW Bowser's Castle is my favorite song to listen to and you made it awesomer. Plus, if Nintendo used your song to some return of Super Mario World like Return of Donkey Kong, then it would be used for Mario trying to get out of the castle before it collapses. And I'm lucky to be the first one to write a review, so Marx out.
Please contact me if you would like to use this in a project. We can discuss the details.