This could be an interesting concept if executed with a lot more content and polish. This very simple implementation of it left me disappointed and wanting more. If possible, I would add several more attacks to the player and make them a proper boss fight. Maybe they could use trope-y attacks like healing potions, legendary swords, invincibility power ups, demon forms, ultimate spells of mass destruction and you have to dodge them all. Thinking about that is quite funny.
I will say though, this art style for the game is quite intriguing! I'm curious to see where you go from here. Keep making games!