Well, a slashing mechanic would make things easier on the player! maybe by clicking or holding the mouse / action button you could do a spin? you should check out how these kind of games handle melee weapons and take some inspiration. I personally would have added a stab button, just for laughs.
Oh also, I would make the base axis of the sword be on the player, not to their right, cause that's a bit more intuitive in my opinion. the sword felt slightly unresponsive when trying to move from the left to the right and vice versa, so I would adjust the sensitivity on that.
that's what I could think off the top of my head. these are just suggestions, not criticism. so you should follow your gut. I recommend letting your friends/family check the game out and tell you if it was fun or not. non gamers give the best impressions cause they don't know what to expect, so if they find it fun most players would as well.
hope that helps! good luck :)