Playing it again, I realized you do, in fact, walk on water. I figured the water was just shallow, but no, you walk on it.
Also, the nails go into set spots on the bodies, not anywhere. Fire near the ass and it goes in the ass. Fire a foot away but in the same region and it stick right on top of the other. Disappointing.
Go into the blood corridor, though, and punch the ceiling. Now that's a cool effect.
Also try blowing the guys out of the helicopter with the particle weapon before they even hit the ropes. Falling skeletons! Then plant a proximity mine by the flaming barrel. Door opens, everything blows up, limbs and skeletons go flying!