It's a cute game! I think you're a bit too slow, your hitbox is a bit too big and the hurt box of the enemies a tad too small, but overall I liked it. I think there could be more to be done with the color mechanic (take Ikaruga for example), but considering this was a solo work and Ikaruga's mechanics are not easy to implement to say the least, I'm just being nitpicky here. Very neat little shmup. Good job!