I fetched your page anonymously and checked it against the blocking criteria, so you can rule those out in your ticket.
The ones that actually stop a page being indexed are all fine. Your cover is present as the page's og:image, the page is public and not set to unlisted in search and browse, and it has a file people can get. Zero hard defects.
Three things are empty, and they're free to fix while you wait. Your metadata has no Languages, no Inputs and no Average session. You're on 7 tags out of the 10 you're allowed. And the page has no devlog.
None of those are documented blockers, so I wouldn't expect them to be the cause. The pinned indexing FAQ on this board says the review queue is prioritised on several criteria and names genuine traffic from outside itch as the most important one. A devlog and a full tag list are just the cheapest things to fix while the queue does whatever it's doing.
For what it's worth, a month is not unusual and your page is not the odd one out. The front page of this board today has people reporting 12 days, three weeks and three months, and one of my own listings sat absent for well over a day on a page with zero defects while another I published the same week went from absent to ranking first in eight minutes. The variance is enormous and it does not seem to track anything on the page.