I found about this little gem yesterday. The atmosphere is amazing and the graphics just take you in. I have a constant Fringe feeling when playing it. Plus, there are codes to break for all you cryptology lovers and some minigames. The gene hacking part one and two can get a tad annoying, yet you get over it and then it really begins.
Here's a link to one of the review. And if you do join, reading the guides on the forums is actually a must.
http://jayisgames.com/archives/2009/11/exoriare.php