Looks good and i liked the intro. Needs some work into the feedback, it took me a bit to realize that the white bars were a countdown to the next action and the blue bars were preparing for attack.
I managed to play a few rounds until the moment i came against three enemies, which quickly wiped out Kuro and then Sayori (since there wasn't anyone to heal her). I *think* it might be a bit unbalanced there in that i was wiping the floor with everyone up to that point.
I think that if you stick with the combat-only approach (ie. there wont be any sort of city exploration) you should add at least some sort of randomized item drops that can help in case Kuro dies because otherwise after the healer dies there is nothing you can really do. Also perhaps the earlier monsters should be a bit more difficult? Up until the moment three monsters appeared it was very aasy.