thanks for trying it! the tutorial didn't end up as good as i wanted it, so i get why you wouldn't understand it
if you wanna give it another try, the tounge attaches to the bugs that are highlighted with a pink hexagon (detection area is around the top of the screen to the middle of it), then you hold shift to attach, when you let go of shift, it let's the tounge go
also while grappling (and while in air regularly) you can still add velocity to swing higher and farther