Tip: Layer 3 backgrounds and tides disappear when you hit a message box, so plan your level around that. For example, you can add a sublevel without layer 3 at the start/midpoint, and include your message there.
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Details for Castlevania: Bloodlines - Mysterious Curse
SMW Music - Castlevania: Bloodlines - Mysterious Curse
i'd suggest lowering the volume of the echo channels significantly more, as they are they're kind of getting in the way of the main channels.
i'd also suggest using an extra channel playing the same notes as channel #4 but having #4 panned to the left and #5 panned to the right, and #5 being very slightly delayed (by like r64 or r96), instead of #4 just jumping back and forth between the left and right speakers.
finally, i think the original song had a piano instead of a bell for channels #0/#1. nothing too major but thought i'd point it out.