I loved the cute art! The gameplay was a little hit-and-miss. I think a little more control for the player about which element they get would be great (e.g. dice weighted towards certain elements) or give them a way to store an element for later, in case all of the remaining enemies are healed by it.
Another way to make the die rolling more interesting would be to charge the player a heart each time they roll when the bar isn't full. That way, they could try to push their luck to defeat the enemies more quickly.