Hello. I can reassure you the game has no such things as "virus" or "harmful software". Sadly, the browsing system keeps giving most of the downloads false claims. It has to do with 2 main issues - browser flagging unknown folders and the game engine that I use. See, Copper Cube 6 isn't as popular as let's say unity or unreal, so sometimes it gets confused as "virus". Those are the main 2 reasons why it keeps getting "detected".
Now you can either download the game or not, it's up to you. I am just reassuring that I personally, intentionally has never put any harmful folders over the course of uploading games for 5 years and countless of YouTube videos, thousand of thousands of comments can back me up. So yeah.
Either way, thanks for the comment.