Tip: Make sure that ALL exit-enabled pipes, doors, etc. have a screen exit defined, or they'll take you to Level 0, the "endless" bonus game. Unless Start+Select is enabled, the only way out of it is to reset the game.
Checked the MML of the port and this actually uses the optimized piano sample to make it last longer. Yet, it's one octave lower than in the original, and for me, that's quite painful and brings it down a bit, especially since it's meant to be a de facto unsampled port. Still, great port!