there's a forum post telling you why it says the game it's a virus
if i'm not mistaken it's because microsoft had the "bright" idea of adding an experimental AI algorithm to windows defender to detect viruses, which ends up accidentally detecting a lot of things as viruses as false positives, including a whole lot of itch.io games

i agree man this game needs its place on steam as soon as possible

The problem is that the developer will have to replace all the sounds in the game with his own, as long as they are not taken from Valve games

And yes, the game will stop being distributed for free, which not many people will support, because the game is not ready for release