The site itself is a simple game concept where the user navigates their way around a maze of tunnels, avoiding obstacles, using the mouse or keyboard controls. The game may be simple, but it is addictive (it even has shades of Wipeout), and keeps you going back for more.
But, its not the game that grabs the attention, but the fact how the site has been constructed. The designers/developers have utilised the Unity platform along with with ThreeJS to create superfast HTML5 graphics. This a site that needs to be seen to be fully appreciated. Make sure that you check it out.