Tip: Bad things to do in the title demo: Enter a door or a pipe, activate a P-switch or a star, complete the level, hit a message block, or die. These will either glitch the music, or force the player into an endlessly looping title level until they reset the game.
I really love this hack! The fact, that it uses the original SMW music, just makes it even better to me! It's really hard to describe, but to me the hack feels familiar and alien at the same time. That's what makes it so special to me. At the very least I think that the SMW cave music really fits the atmosphere of those alien and distant planets/caves and the SMW ghost house music really fits the futuristic setting where it's used. Too bad this hack never got finished (at least not the way it used to be in this demo).