I have to say... what terrible UX ! Scroll right? In a world where literally everyone else scrolls down ? Its completely un-natural if you're not using a tablet or smartphone ! Unless you have one of those fancy mice with the horizontal scroll button, but most people won't and will have to click and drag (rinse and repeat).
Works great on a Mac, which have horizontally-scrolling trackpads or mice. But obviously they did this as a fun layout for a card game!
Same category as tablets and smartphones my friend.
How about the billions of other internet users who have a keyboard and mouse ? At least make it keyboard tap or mouse-click friendly !