A simple game rendered on a Canvas element, controlled by clicking the window to launch a magenta square upward against gravity. Obstacles, rendered as green blocks, continuously scroll from right to left; the score increments every frame the player avoids them, and resets upon collision. The game loop uses a custom `d3.timer` to update physics and redraw the canvas, while a separate `div` element displays the score. The code applies basic geometry for collision detection and movement, with the D3.js library handling selection and layout conventions.