Not specifically related to the game, but how do you download vr games from itch.io to your quest?
First you need to setup your Quest to be able to sideload apps and games. I've left a link to a detailed step-by-step in the download instructions, but here it is: https://uploadvr.com/how-to-sideload-apps-oculus-go/ . You can also use SideQuest for this: https://sidequestvr.com/setup-howto . The process is very similar.