Hello! Thank you for the kind words!
The warning is likely related to the lack of code signing for my program/executable, which means that the "program publisher" property of this software is left unspecified ("Unknown publisher"). Even when trying to download Sushi's ZIP file on my end, I get the download blocked.
Getting a code signing certificate (a license which would require frequent renewal) is unfortunately very expensive. This issue really frustrates me, as I understand the anxiety that can come from those warnings, and don't want to stress anyone out. But for now, there is nothing I can do to fix this.
I'm really sorry for the inconvenience there!