A rhythm game? Great idea! I especially enjoyed your recorded intro, you succeeded in making that atmospheric, I was immediately a little scared of the Sirens. I agree with JRJurman that a little more feedback would be helpful. Even something as simple as a ping for 'yes, well done' and a buzz for 'wrong/missed it'. To further agree with JRJurman, you could definitely get something Beat Saberish out of this with a selection of tracks
Nice work!