I had to use the Page Up and Page Down keys to navigate this; apparently either the mouse is not supported, or I couldn't figure out how to navigate this site with the mouse.
The far left and right sides are clickable to "turn the page", so to speak. It's an invisible area, though, so it's not very easy to deduce from just looking at the webpage.
yeah, it's using the present tool, so it's only really mean to be navigated by keyboard for presentations. No one seems really to eager to polish this beyond whats needed for giving live demonstrations.