Not being indexed is a side effect of being in quarantine.
Though the game could also be just not indexed yet, on top.
My game does not contain viruses
That's what a virus uploader would say... ;-)
This is a community message board. I do not need any proof, as I can not unquarantine the game. And support is not asking for proof. If they would do so, it would not be here. They are doing whatever they do in case of a quarantine. And they will not tell what that is. From reading threads like this, I can tell, that whatever it is, it can take somewhere between days and months.
Anyway, you can't prove a negative. Not with a virustotal score you can't. I have seen hacked Itch accounts by the hundreds and I have seen several malware that did not trigger on virustotal, and also a lot of regular games that did. I even saw a signed malware, and a malware uploader that asked for help in this board.
If it helps, I do not think your project is malware and staff will probably arrive at the same conclusion. It is said that projects with more traffic will get processed faster than projects with less traffic. But it is unknown how much faster. Removing actual malware is still a priority, even if the fake account only has 10 followers. And sadly, Itch gets abused a lot. It's not only malware projects, It's comments with links to malware, and blog posts with the same and other things. Like the ddos attacks. Thanks to those there is the cloudflare thingy.