Windows can't be sure that it's a malware so he prefers to not take risk. It's up to you to trust me; if you want to play it, in your antivirus put an exception on my program or deactivate it for a lapse of time.
Im russian,but i can tell what it says: "System Windows defended your computer Filter SmartScreen in Microsoft Defender prevented the launch unknown app,that can expose computer to risk"
Anything you download on internet might be a virus, it's up to you to trust the programmer. I can't prove to you mine is not a malware, but i have 1.5k download and no one has reported it. the screenshot you shared is just a warning window, you can ignore it.
