My in-dev game thing (http://www.aliengrit.com http://www.aliengrit.com) shares game logic code across the client and its Node server. If you've cleanly separat

My in-dev game thing (http://www.aliengrit.com http://www.aliengrit.com) shares game logic code across the client and its Node server. If you've cleanly separated rendering logic from game logic for all game entities, it works really well. (i.e. the server just runs the same code without the graphics bit attached).