Very nice and well polished game. I always love it when a short game manages to incorporate a boss and has a proper ending and doesnt overstay its welcome.
I only have like small tips and thats more so personal preference. You could incorporate some abient music to accompany the intro text, and maybe add some pitch shift to the fire and damage sounds as they get a bit repetative. Also: how dare you make me purchase sunglasses and then not have them show up on my character :(
PS: your game reminds me of another game I rated: https://itch.io/jam/brackeys-6/rate/1177392