Whistle blowing game for js13kgames. Click here to play it. Requires WebAudio and getUserMedia; works in Chrome and FireFox.
Also doubles as a nifty audio visualizer.
You can enable endless mode to just use it as an audio visualizer:
http://mattdesl.github.io/whistleblower/demo/index.html?endless=true
MIT, see LICENSE.md for details.