I see now, volcanic island theme sound good :) I see it fits the Tide theme.
I would like to also make a suggestion to add Move time: instant (or really fast) setting in options. Heroes movement on the map might be "too slow" for some players (at least for me) after playing a while. I would like to finish moving heroes faster on map. Maybe it's a case for rendering on my PC I am not sure. Please consider it in future updates :)