It's always interesting to see Phaser used in innovative ways, and this 'asteroids educational game' is certainly a nice one!
Kupiter is a studying tool that models the old Asteroids video game. Players shoot asteroids with letters on them to answer questions, and questions can be created and shared with others. The purpose of this project is to offer a unique way to study / learn by playing a game that is engaging and effective.
Scroll down the home page and pick a set of questions to try it for yourself.