Nice!
It was simple and very charming!
I really like how you use a childlike and innocent girl to save the world :)
Although I really thought that, just like in the Space Space Shooter, a team of two will make the story even more appealing! For eg, I was expecting a boy to meet up the girl in the story and they team up to defeat the final boss ;)
Very good work overall! But I'm pretty sure you agree that there can always be something to improve on on every piece of work :)