Woaaah thanks for the feedback ! Yes, we too think it needs more lenient by widening input windows.
Definitely point taken. Actually this is our first time make rhythm based game, it is more complex than we thought and need more time than we thought to calibrate the beat and input. But it is precious learning experience for sure.
Your insight on point actually, we need to play more with the beat for rhythm base game. Thanks again for the input, we really appreciate it.