Fun little game, the comic style segments are very nicely done and helps set the tone. Story is a bit goofy and cliché; but let's be honest, that's what the magical girl genre is all about.

A few suggestions: 

First of the cloud things that maintain the barrier are a bit too dark, on a low brightness screen they are nearly indistinguishable from the black background. Overall a brighter colour would help them stand out and make it more obvious you are supposed to target them. 

Secondly I'd suggest moving the hitbox into the torso area and maybe a bit smaller. Also try adding a glowing orb/heart that is slightly bigger than the hitbox, this would help with visual clarity in regards to bullet dodging. As a general rule for games like this, always give the player more leeway than than they think they have. If giving them a small hitbox makes the game too easy, then all that means is its time for more bullets ;)

Now with those nit-picks aside, its a neat little game that's fun to kill time with, and holds plenty of potential for growth. Good job on the submission.