You should just be able to install it through the itch app (itch.io/app), and then launch it from there. It's compatible with the Rift S, and Quest 1 & 2 (PCVR only). Is there any particular issue you're having?
Do you mean you only have a Quest? The game is PCVR exclusive right now (hence why it's here and not on SideQuest or App Lab), so unfortunately you'd only be able to play it if you have a VR ready PC.
