Windows Defender is one of the worst antiviruses. There is nothing more to explain to you, since you are not asking, but demanding.
Most anti virus apps warn about games from itch, but 90% of them are perfectly fine :)
Thanks for the clarification! I never had mine go off and I have downloaded a small handful of games off of itch. I was worried mine was a bad egg
This is the very first time a game on Itch was flagged by Windows Defender, on my side. This is probably really worth the suspicion, especially for what should just be an HTML file running on Twine / SugarCube and some media files.