You might not enjoy it like I do, but it sounds properly..."One Piece-ish" [if that makes sense]. It's definitely worth a listen to see.I'll have to remember to try and listen for it. I usually play on the bus/train/metro so I don't have the sound on at all.
Also, how do you play without sound? I use the sound/rhythm of the attacks to gauge when I should tap/attack. I can't imagine playing it without sound. I guess it can be something you can get used to.