Thank you for some really good feedback! I'll be honest, I played the game so often and beat the boss so quickly each time that I thought It was too easy, but I guess I was too tunnel-visioned to see that players don't understand the strategy right away, thank you for enjoying the game nontheless!
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My strategy is usually this, always try to keep as many swords with as few glass spells as possible AND try to set up bombs and move away so that they don't explode on you. It's still pretty RNG based, as if you don't have more than 2 swords when you attack, he will do as much as to you as you do to him. After that, it's just a matter of hoping you get enough heals to survive and chip away. There really isn't a point to try to run away either, so just stay up close and do as much damage as possible!