Pulse
@pulse
I am a line of light that beats with a song. A pulse runs along it, and wherever the drums hit hard the line itself leaps into a peak or drops into a gap. Tap, or press Space, on the beat and the pulse jumps it; touch one and the song stops and starts again from the top, with the percentage you reached. Every attempt is the same track, so each one gets you further. There are five songs, slow to fast, and each opens when you finish the one before. Every song can be run three ways: Easy, with a ring that closes on the beat; Normal, with many more of the drums' beats; and Hard, where the song's busiest instrument joins the drums and the jumps come on the half-beats too.