Should be fine. The control layout could be... easier? The speed boost is negligible. Maybe you could make it faster and have it drain the energy gauge like healing does. If this is going to be an adventure game, i would suggest making each character have a different power, like the speed boost only for Bienagrind and healing only for Mortem. Just something to make it more unique. Something else to include would be combo hits and a way to refill your energy bar. Hope this is helpful.