This level really isn't working. Randomly "teleporting" enemies are bs. There should be a clear visual indicator and a reasonable delay when an enemy is about to "respawn." In addition to that, the whole level seems to centered around abusing the enemy AI (shooting behind a wall so that enemies pile behind the wall you take them out with a single explosive) or the game's systems like repeatedly using the generator to take out the lights. I can think of a couple of ways to make it more interesting to take out the lights in a room.

To add insult to the injury, you can die *easily* during the long cutscene that is forced upon you right at the very end. I got sledgehammered to the face during the third dialog box or so.

I did however like the idea of a vast an complex vent system that almost works as a puzzle of sorts in itself. Also, turning a normal enemy such as an Incubus into a full-blown boss with the help of the trigger system is neat.

" I'll say, if you know how to efficiently use your weapon (and take advantage of the AI) you can easily destroy every face you encounter."

Nice foreshadowing over there :^)