Hello! That’s a strange issue that’s been happening, though not on every installation of Windows Defender as far as I know. It’s a false positive that can be a bit tricky to get rid of. You’ll probably see it in other games from this jam as well.
You can read more about it here:
https://www.reddit.com/r/gamedev/comments/1gcld3r/player_detected_trojan_in_my_u
Essentially, it’s a weird Unity false positive issue.