Update game description on website

Summary: This updates the description of the game after some discussion on Twitter and this article: http://gamasutra.com/blogs/LarsDoucet/20131203/206159/On_Procedural_Death_Labyrinths.php

Test Plan: Viewed the website and saw the new description

Reviewers: Sabre070

Reviewed By: Sabre070

CC: buildbot

Differential Revision: http://code.redpointsoftware.com.au/D112