I have two complaints. The first is that most of your characters look the same,Cnut with different hairstyles, costumes and heights. Palette variation is a good cue for differentiation, and silhouette comes just as important.
For the animation, I see very little commitment to the attack from the character's body. Typically before a forward movement there is a windup to gain momentum. I would have his arm bent until the second half of the swing, and definitely get his body and legs more involved.