Cool game. The art there was cool. I wish the attack was faster and that the hitbox was just the edge of the sword. I also wished there was music in the game that would have been nice too. It would have also been nice if there was a variety of enemies. There could have been blue skeletons or red skeleton who shot some sort of projectiles.
Suggestion: Maybe you could also move the area so it wasn't just in one place, but more like you have to defend certain areas, that would have been cool or some sort of boss that appears during certain phases. Overall, nice work though.