The mouse controls feel SO wrong in this game. It seems like it uses inverse mouse acceleration, where small movements move the mouse much further than large movements. Is there some way to completely disable this?

Managed to find a solution - in the file
C:\Users\YOURUSERNAMEHERE\AppData\Local\Obduction\Saved\Config\WindowsNoEditor\Input.ini add these lines:

[/Script/Engine.InputSettings]
bEnableMouseSmoothing=False