Thanks for playing our game :)
Many people have said that it isn't clear that you have to manually click to harvest things- and yea, that's true, it probably should be communicated better in-game; however there is a 'Helpful stuff' section on the game page telling you (though it doesnt stand out well, so i cant blame you for not seeing it)
We've asked BitDefender to flag it as a false positive, but we havent heard back yet