There's a weird issue, I've only tried the First-Person mode so far, but when you are using a mouse to look around, if you move your mouse slowly, the camera doesn't turn at all and it's really jarring.
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I’ve recorded a video demonstrating the issue (I’m using an 800 DPI mouse).
To work around it, I modded the game, in the FirstPersonController class in the CameraRotation method, I removed the sqrMagnitude check on _input.look. That check arbitrarily caps how fast the mouse can turn the camera without any real performance benefit, so dropping it lets the cursor movement feel much more natural and responsive.