Video game with only audio

This is an awesome audio interaction I found recently on the web.  It basically is a video game with only the audio and no visual.  The aim of the game is to shoot the aliens, that you can see based only on the audio queues given to you by the game.  Apparently makes you feel very vulnerable.  If you want to know more check out this post by the creator. 

http://www.indiepubgames.com/game/Deep_Sea

Lars  Hopman