Video later on the page actually shows some gameplay. Looks like normal chess where you can wrap around the sides of the board. Kinda nifty, and being on the globe instead of flat makes it potentially harder to notice when pieces are in danger.
Though for some people possibly the mental effort of wrapping the flat board moves would be just as hard to deal with.
EDIT: Looks like the guy has run ONE other kickstarter… for exactly this same thing. Only had a single actual backer then, with a goal of $9k. Now his goal is about $7k, and he still hasn’t learned the need to market