Every time you hit one of the undead your blade will dull slightly and become less
effective. Luckily for you there is a weapon sharpening station in the armoury that
you can use to get it back to full slashy goodness. You can keep an eye on your
weapon sharpness with the weapon bar at the top of the screen.
Your health is important! If you get bitten, your health will inevitably drop. Visit
the medbay where there is an automatic health station that can get you back to your
mission. Be careful though, the machine needs time to restore its functionality
after using it (also, it needs power... what?? See the next section)