Yes, it was Windows OS. On Windows 10. Don't worry about it.
Viewing post in Help Him? jam comments
I also ran the game on a Windows 10 and had no issue getting it to run. However, Windows Defender stopped it first from downing, then from opening until I clicked "run anyway" because the file is not commonly downloaded. (This is an extremely common issue for such games, so I did not worry about running it.) I don't know if maybe your antivirus blocked it or it was some other issue, cause have had Godot games that just refuse to run for no reason :(