GamesFPSSteam Next Fest’s most-popular early demo is an open-world PvP FPS about building badass giant walking mech-basesWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. GamesFPSSteam Next Fest’s most-popular early demo is an open-world PvP FPS about building badass giant walking mech-basesWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. (Image credit: tinyBuild) SAND. It gets everywhere. And so does its demo, which is climbing up the most-played charts ahead ofSteam Next Fest’s official start date. Steam Next Fest properly begins on October 14, bringing literally thousands of demos along with it, but a bunch of indie teams have cheekily uploaded their demo a few days early to get a little head start on the digital festivities. Developers Hologryph and TowerHaus …