The document discusses various techniques for 2D game development, including: 1) It compares classic Flash games to modern 2D games on consoles, noting improvements like HD graphics, smooth scrolling cameras, and parallax layers. 2) It demonstrates a "BunnyMark" benchmark for rendering thousands of bunny sprites using different rendering methods like bitmaps and canvas. 3) It introduces techniques like cameras, zooming, parallax scrolling, and hit detection points. 4) It covers topics like projectiles, collision detection, level editing, character animation using sprite sheets, and more.