Thank you so much for the feedback, as it was my first game ever made I'm really happy that some people enjoyed it as much as I did! The idea with showing where the next fireball goes is really clever, if I find time to work on the game I'll implement that for sure.
Also will make the hitbox bigger. I'll take a look about the health suggestion but I guess like the idea with showing where the next fireball will go could already fix this issue.