A first prototype is going online in about an hour or so. There will be a link to a Windows, Mac and Linux version on this page, as well as a web player - which will require you to download the Unity Web Player application. There will be no enemies involved. It's mostly a test of the game mechanic involving orientation by sound.
You will be able to run around in the first level. Try to find the floating blue sphere before time runs out!
A blog post will follow when the game is uploaded.