see the itch.io page for full description and documentation. I had such a panic because I thought my project was already submitted after I hosted on itch.io through the "Submit your entry" button.
https://harper-nicholson.itch.io/santa-experience
documentation here in case you missed it anywhere else:
https://docs.google.com/document/d/1Rsko-F-awgsOWVktnYHrR8jzeuDzaPvoo59_E2uFZJM/...