Hey Daniel, thanks for your feedback :)
The metronome to start is a great idea! I definitely add it in if I continue this.
Currently, spamming the same note won't get you high scores. Unless you spam them insanely quickly though since each beat has a minimum of 1 damage, maybe I allow it to do negative damage next time >.<
But outside of trying to hit notes reaaallly fast, it does actually have incentive for players to make - i won't say beautiful, but at least half decent melodies as the algorithm will try rate the melody and scale the damage accordingly. If I remember right, it should be possible to deal either up to 16 or 32 damage per note.