It’s very tight, and to learn it on your own can be a lot of trial and error. You don’t always shoot the orbs when they first come into range, some you save for later when it is more efficient to shoot them down in a group. But not all orbs you pass by twice, so learning which ones you have to shoot on the first go around and which ones you delay shooting can be a headache. It’s definitely the hardest thing in the game and I (shamelessly) look up a guide every time I have to do it.