Hey that's odd. Are you sure you have all 3 files in the same directory? You need:
- point-o-8.exe
- point-o-8.pck
- godot-jolt_windows_x64.dll
The game can also take a little bit to load. Are you at least seeing the disclaimer at the beginning or is the screen entirely black?
Sorry that the game isn't working for you. I should note that you are the first person to have this issue, regardless of platform, so I'm hoping there's a not-too-difficult fix.