I/O Revision II, a visual novel.
It has been translated, though unfortunately I can't link to the translation. The story is unusual, and very, very hard to explain without spoiling it; let's just say that if you like Greg Egan's works, there's a good chance you will like this.
Just following links from your link, the translation is at http://lemniscatranslations.wordpress.com/io/
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