I tested this online tool with a variety of personal files, namely early builds of hackweight, the current build of hackweight, early builds of fatsona, and other small .exe games I've made. I found it to consistently return similar warnings and looking into it shows that the website returns false positives often. I suspect that because these .exe files aren't code signed, it raises red flags to simple antivirus systems (windows defender has given these programs issues before)
I can assure that everything I put out on my end is secure, and I don't think that there is any web-based breach given that my personal files returned the same warnings
regardless, if you find anything to indicate that the game files are unsafe, reach out to me on discord @metrack and I'll look into it asap