Hmmm game doesn't open for me. I'm using Safari on desktop -- not sure if that's relevant. Looks like things crash early because there's no WebAudio context (Safari requires a user interaction with a canvas, such as a click, before it can create an audio context, IIRC). Not sure if that's the actual problem or just an aside, though.
Ok, the game runs fine in Chrome. I like the attack animations! It took me a moment to figure out I needed to "roll the dice". Maybe an arrow pointing to it on the first turn would help, or like a glow around it or something. :) I like the different enemy sprites. I think with a little polish this could be really fun!