You're browsing the GameFAQs Message Boards as a guest. Sign Up for free (or Log In if you already have an account) to be able to post messages, change how messages are displayed, and view media in posts.
In GameSpot's review of the game, they say that the game uses the Source engine. I tried Googling but couldn't find any info on what engine it uses. Also, the screenshots don't really resemble other Source engine games I've seen.