A fun and challenging shooter with attractive design and music.  The game does a great job of teaching you the skills you'll need to gitgud as you go.  I saw only two downsides.  First, the "quiz" sections of the game are not very intuitive (how to play, not the questions themselves).  Second, the password system seems designed to feel "retro" but is actually just as tedious as you would imagine.

The writing is serviceable, the characters are cute and fun, and the gameplay is tight and cool!  Great game!