You gotta be more generous with attack colliders for the player and make a enemy collider smaller. Otherwise it's a bit too hard to understand where I'm safe or where I can damage enemy.
Thank you so much for the constructive criticism. I've now adjusted the player hitbox and boss attack cooldown to make it easier for the player to dodge and hit the boss. Also be sure to hit right click to parry the boss, which also gives an opening for attack!