Interactive music? A dev after my own heart :,) <3 <3 <3
I played this game for a lot longer than I thought I would. It was really exciting to draw just the right line to send my ball flying.
My one gripe is that it is pretty much up to luck whether you speed up or slow down. If triangles happen to spawn in your trajectory, then you rocket across the stage which feels joyous! But if those weird scraggly things just so happen to spawn right in front of you... well, you're shit out of luck. This was especially disappointing because I could never live long enough to hear the full song, which REALLY bums me out!
Overall, fantastic job with the music, and double triple mega points for the interactivity! The fun factor is off the charts as long as I happen to get lucky (which is not often enough!) My suggestion would just be to remove those scragglies entirely, because there's no strategy to avoiding them. Let me fly!