Thanks for such a detailed feedback! You can attack only head of the boss when it is not using laser and his other parts will cause damage to you (a lot of damage). You can move mouse fast to the opposite direction of the sword and it will flip, so it would be easier to avoid projectiles. And I actually thought to make sword deflect projectiles but than I changed my mind because I thought it would make game too easy. Maybe I had to remove laser of the boss and make player to deflect projectiles to damage him. So I think that I made game too hard and it is not intuitive enough.