Antivirus software, especially when not bundled with your operating system (such as Windows Defender) is notorious for false positives. If you want some assurance that my game isn't a virus, the fact that there are other commenters here, who have apparently enjoyed the game, can probably give you some indication that the game is not, in fact, a virus. If you want more proof than that, I'm afraid I can't help you. Honestly, these days, having extra anti virus software on Windows isn't worth it. Windows Defender does a good enough job. Just my opinion, though.