A modern take on classic Pong using HaxeFlixel. See it in action on https://brandonclementson.itch.io/pong-master.
HaxeFlixel is an open source 2D game engine written for use with the Open Flash Library and the Haxe Toolkit, it is completely free for personal or commercial use. It enables multi-platform development for native targets on mobile and desktop as well as Flash and HTML5 on web platforms.