I've been looking through the topics and trying a lot of different suggestions, but I can't get mouselook to work. Pressing "U" in-game gives me the message saying mouselook is enabled, but I can only rotate my vision horizontally.

What settings should I change in order to get mouselook to work? Because this game is quite difficult.

In your Blood.cfg file check for these settings:

Mouse_Aiming = "U" "N/A"

ControllerType = 1

MouseAiming = 0
MouseAimingFlipped = 1
MouseButton0 = "Weapon_Fire"
MouseButtonClicked0 = ""
MouseButton1 = ""
MouseButtonClicked1 = ""
MouseButton2 = "Weapon_Special_Fire"
MouseButtonClicked2 = ""

MouseAnalogAxes0 = "analog_turning"
MouseDigitalAxes0_0 = ""
MouseDigitalAxes0_1 = ""
MouseAnalogScale0 = 65536
MouseAnalogAxes1 = "analog_moving"
MouseDigitalAxes1_0 = ""
MouseDigitalAxes1_1 = ""
MouseAnalogScale1 = 65536

That seemed to do the trick! Thanks!

No problem. Enjoy!