This is currently an Android and Tegra X1 and K1 exclusive. That means you need an Nvidia Shield tablet, the Shield Android TV, the Nexus 9, or any other device with those chipsets. But here’s the interesting thing the game has touchscreen controls. Some games have been Shield exclusives, like Half-Life 2, but have required a controller to play. With touchscreen controls being an option for this game, there’s definitely the possibility that this could work for iOS.
Via Touch Arcade