Went YouTube diving and found these tutorials that might be helpful. I have yet to find some tutorials with Line Rider 2, but someone somewhere is probably working on it right now. Visit the authors’ pages and check out their other works.
Line Rider Catch Tutorial by H2O Studios
Tube Tutorial by H2O Studios
Flip Tutorial by JacobB103
Line Rider Boomerang Video by ndemeire721
Line Rider Velocity Video by ndemeire721
Line Rider Exit Video by ndemeire721