Nice job!
I'm so bad at it that I can't even get to the end. Have you thought about adding a skip button to the text at the start? I'm constantly dying and I have to wait everytime for it to show up, and sometimes there is a fireball in the ground (almost at the top of it) and I can't shot it but I die when I touch it and last thing - I feel like there is a delay when fireing and jumping and so it's making it even harder for me .
Other than that I think it's a nice little game.