I like writing little retro games for my kids but these are rarely 'finished'. So I set myself the project of writing a full game in a week, using Lua and targetting the Pico-8 virtual console:
HTML5 online playable version: http://www.lexaloffle.com/bbs/?tid=28846
Lua sources: https://github.com/wstephenson/pico8-limpets
This project is one of its kind!