I got a reply from DLSite a few days ago, they claim it's safe and it is a false positive and they did double scan it, but didn't find anything. So the DLsite version is probably no different than the one here.
Screenshot of the reply:
View attachment 3184136
Realistically their response isn't worth very much. All they have done is likely run an automated scan with a random anti-virus product and it doesn't tell you anything more than any random user doing the same. Presuming they don't just always respond with the above without even checking.
Defender's detection is Win32/Znyonm which
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so it
could be a false positive:
Virus total does some automated dynamic analysis
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and there are a few oddities like Windows error reporting getting terminated but that's probably because game.exe was run without the associated DLLs so the executable errored out. Similarly the anti-analysis is checking for a static cursor which could easily be legit in a game.
I'd be interested in knowing what triggered the detection but you can't be certain short of loading it up in a VM to see what it does when it has all its files and libraries intact. Maybe treat it with caution until the false positive goes away (if they go away) or run it in Windows sandbox. I definitely wouldn't take DLSite's word for it being OK just because they ran a scan.