By "actions reflected on the music", do you mean, you want the beat actions to be more tied to what was happening in the song, or you want your player actions to impact the song more / have more audio feedback when you click/drag/flick? Just curious! :D
For the second point, the slider (rectangle) action was actually supposed to apply an audio filter to the song. It sounds really cool! Except it works locally and didn't seem to come out in the release version. So that's actually a bug that I'll try and fix in an update later, but sadly I only noticed it too late for the game jam.
Thanks for playing and leaving feedback!