No offence, but how am I supposed to fix that? I did not add any malware to the game, therefore I can't just remove it XD
The only "solution" I am aware of is paying for a code signing cettificate, which makes the executable look more trustworthy, but it costs like $200/year, which is not something I can afford for a small indie game almost no one will play anyway.
IIRC, you can just add it to exceptions in your antivirus. Or if you don't trust me, just play it in a VM/emulator, it should run just fine in those thanks to low system requirements.