Oh boy, i spent like 5 min trying to learn the controls and then mastering them, but it was worth it, really cool and quite addictive for your first play.
Now i dont know if it is a bug or it was intended, but if you see that your note is getting the green bar, you can just hold the note till it reaches the end and get points.
All in all pretty fun.
Viewing post in Requiem - You Aren't the Hero Anymore jam comments
Thanks for spending time learning the controls!
Regarding the green bar, it is just an incentive system to encourage people to hold the note when it sounds right (or else nobody is going to hold any note).
On the other hand, if you try to hold the note that fills the red bar and you will notice the dissonance from the voices.