Lin3s Game - Concept & Design
The concept is this - bounce the ball between two lines for as much time as possible, against the increasing difficulty.
Draw 2 lines and when you draw the 3rd, the 1st line disappears. Only 2 lines on the screen at all times.
Bigger and more shots here: https://www.behance.net/gallery/55558071/Lin3s-Game-Concept-Design