I don't see how this game is graphically intense, it looks like something a hd4000 gpu can handle very well at a higher resolution like a 1080p display, you can't compare this game to the graphic details of illuvium, Undeadblock looks like a 2012 graphic design game.
It's not only undeadblock but whole of blockchain gamings are still using old render just like ps2 graphic. I never seen any HD gaming that was using the new engine. There are some maybe exist but mostly of the blockchain games are still using old engine without thinking to adopt the new graphic.