Hi, unfortunately this is not an option at the moment and will unlikely be in the future as we are no longer working on the project.
Recent community posts
I can tell you where to find mine atleast:
Or @PXLRN on Twitter
Currently working on a couple mobile games, one of which is a huge revamp of a previous work I called Slice Knight. It's on the website, I'm making a huge update with new chars, skins and tweaks to a bunch of game mechanics.
// Connor Thorpe - Game Designer and producer :)
You should have no issues with copyright. The song is old enough to no longer have any copyright associated with it, and is now free to use, the copyright notice you saw was most likely just stating the name of the song and it's origin. Thanks for playing though!