Graphics were great, music was good, game play has the difficulty of a shmup.
Aesthetically, I like what is here, the crt filter was a nice touch. The visual ques when you get hit was nice, fairly extravagant and I like how the animations were animated to the beat of the song. The pixel art was of higher quality than other entries I've seen so far (which makes sense, as this is the first quartet that I've encountered).
The variation of the bullet patterns is nice, and I like how there are essentially phases for the types.
I didn't get that far, but I got far enough to see the phase shift once.
Overall, good work!