Pretty cool idea! I like the spin of death being a protector as the kings time has not yet come and the art looks nice too. It would have helped if there was a bit more feedback on the dash and the attack though - maybe an animation, sound effects or particle effects would have been good so that you can feel the impact of your actions more. I also felt like the cooldown of the attack was a bit long and especially if the barrels get faster and faster I often came into a situation where I needed to use my attack to protect the king but then could only stand by and watch as he was hit by another one.
Overall you did a great job though! Well done :)