Thank you! I suspect the problem is in how I uploaded the build. Are you willing to download the zip using a browser, and see if it runs when launched directly? I don't have access to WIndows for playtesting.
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I downloaded the game and opened the zip, the main file was named saga.x86_64, I renamed it to saga.exe and it worked. I think that the itch launcher starts the UnityCrashHandler64.exe instead.
The game worked! the mouse sense was extremely high, I have noticed that this can be different from linux to windows. But the gamepad controls worked fine!
Although I would have preferred a twinstick aiming method instead of moving the courser around on the screen.