One more and then I will stop: there is a canonical doc for exactly your question, and it is not the one I quoted. itch.io/docs/creators/getting-indexed.
The line that fits a 13-day wait: "Your page may be marked for review by one of our internal checks designed to prevent abuse." And: "If your page is correctly configured but not indexed, then it is queued for human review. You will have to wait for a reviewer to visit your page before it can be eligible for indexing."
It also gives the baseline list to confirm first — Public with none of the access settings limiting it, a cover image uploaded, and real files on the page ("Empty or placeholder pages will not be indexed").
And the part worth reading before frustration sets in: "do not attempt to circumvent the system through the creation of new accounts, deleting and recreating pages, etc. This can be flagged in our system as suspicious activity and may result in more delays in indexing your page."