You have a strange definition of going viral. https://www.google.com/search?q=link:https://shawnsvn.itch.io/tfs
You got 700 smileys from your developer group and the post was shared 22 times. Adult visual novels with ai images typically do not go viral.
Anyway, if the game really went viral, chances are, that Itch will work faster on the quarantine issue than for similar games with less traffic.
No one will tell you why the game was put in quarantine. It defeats the purpose to tell actual malware uploades why they are under suspicion. It is the standard quarantine message. That's the same for all quarantined games.
Some general information here https://itch.io/t/4120453/unofficial-search-and-indexing-faq , but mind you, your account is 11 days old and people will typically wait several weeks for getting indexed, unquarantined and so on.