In order to unlock extra options under the "Options" menu, simply beat the game once.

Run/Walk: Makes Travis Run by default.
More Blood: Makes the creatures spray more blood when attacked.
Noise Filter: Allows ability to turn off screen "Grain" effect making the graphics sharper.
Bloody Footprints: Travis will leave a footprint of blood with every step he takes.
Flashlight Filter: Change the light of the flashlight to a smiley face, soccer ball, jack-o-lantern or the mark of Samuel.