(Not the author, but I've played Line Rider a lot a long time ago.) The character isn't directly controllable. They're affected by gravity, and collision with u

(Not the author, but I've played Line Rider a lot a long time ago.) The character isn't directly controllable. They're affected by gravity, and collision with user-drawn lines. You can also draw "boost" lines that accelerate the character when touching, and "decoration" lines that don't interact with the character.