You might want to look at the calendar and consider when you released the game.
Itch will obviously not tell what the supposed suspicous activity was. But there is no more to do than contact support. If you already have done so, please wait. Also, your game was published 5 days ago, how could you have contacted support a week ago? For what? Link confirmation? I was not aware they would do such a thing. Do you expect them to download and scan the file provided? I have serious doubts that this is done. They would have to ensure that the file does not change afterwards. There is a reason why they mark external links as external.
If you use the butler app to upload your game, your limit is 2GB, as far as I know.