Awesome demo! I'm truly terrible at this genre of game, especially in such a short play session. It was a lot of fun despite my own ineptitude. Definitely a tough game! I must have forgotten about changing my ship's speed and I bet it would have come in handy. The ability burst through enemy bullets is a great idea and one I regrettably underutilized.
The music is wonderful and I love the detailed art and unique designs. The Blue power up was by far my favorite of the three styles.
Unfortunately I don't have much feedback to give because I don't have a lot of experience in this genre. I personally thought it was difficult, but not in a bad way.