Each game on Steam goes through their approval process. Especially
Before your store page or game build can go live, there is a brief review process where we run your game, look at your store page, and check that it is configured correctly and running as expected and not doing anything harmful. This takes between 1-5 days.
Kolanaki@pawb.social 7 hours ago
I was thinking it was the Deck compatibility or just the fact it was on the store front, as if there is some kind of vetting process to sell your game on it. AFAIK, you just need to agree to their terms and pay ~$100.