I was using Chrome. It is strange, considering that everything else seemed to work fine. By the way, I felt a little embarrassed discovering your game actually does have music even if I can't hear it - I never would have spammed my own audio work at you if I hadn't thought there was a gap there!
Yeah man nanoloop is really fun - once you get the hang of the interface it's a really intuitive, easy to use step-sequencer. I made that album with the nanoloop 1.3 cartridge on a DMG (grey brick gameboy), also have nanoloop 2.0 for the GBA. Fun to do it that way, though probably a lot easier on the eyes doing it via an app! And the sound quality is probably comparable, as I assume the app emulates the DMG hardware -notoriously favoured over its successors in the later Gameboys by chipheads...