Can you confirm that this was from a recent download taken from this Itch page, and possibly name the virus scanner you used as well? I've tried to scan the Mac version of the file myself via multiple online resources and was not able to detect any malware. I've also asked to confirm if it came from this specific Itch page, as there are malicious websites out there who've redistributed the game and DLC with malware. It's possible you might've accidentally downloaded from the wrong website. (edit: I've since scanned the Windows version as well and found nothing.)
After doing a quick google search, I've noted that "Cobalt Strike" is an official and commercial platform used mainly by cybersecurity professionals to detect and simulate potential threats to a program. Since it only supports Windows users, all Mac and Linux users need to depend on "CrossC2" to extend its command-and-control (CD) capabilities. As you've used the Mac version, it theoretically makes sense for "CrossC2" to be present.
With that being said, bear in mind that I am not the developer (I am just an Itch moderator), but I believe this was just a false positive flagged by your malware scanner. I'd suggest trying others to see if you get a similar result.