I am pressing X and there are no fireballs spawning. Did you forget give the player the thing that enables them to shoot fireballs?
Edit: Oh, I found it. Oops! There we go.
You just had to follow the path indicated and you will have it in sight. If you found it unfair that the character only has one life, I will find a way to program a simple life system.
Great! I look forward to seeing the game improve.