I want more! This game is really good. I love how the bullet interact with the enemies. The transformation when reaching 100 power is a great idea! The different sprite after transformation is a really nice touch. I also beat the game with both characters.
On the other hand, I have a few critics for the game. While Yami has homing shots, her bullets seem to deal more damage than Akira. The BGM is also too low for my taste. Maybe add a sound setting to adjust the BGM and sound effect separately. And the last one, the character (even Akira the fast one) move too slow, but this one is just my personal preference.
That being said, this is a good submission! Good job!