This is simply amazing! I'll have to play it for my channel some time. I especially love the dynamic lighting, and the smoke in the earlier video.
In terms of ideas, I would like to see 173 move when behind a wall despite the player's looking at it. Even if you prefer it the way it is, adding this into an agressive NPC's option would make me happy.
Also, I would like to see 106 get progressively more agressive to the player as the player continues to evade him. Like mentioned earlier, he could use, as I'd like to call it, "dimension hopping" to get closer to the player without the player knowing where he'll come from. And since he is the God of his dimension, I assume, couldn't he create various monsters to hunt you down and attack you, or even one that latches onto the player to act as a beacon?
I kinda' skimmed over the last 50 pages so I could've missed something, but how faithful of a remake do you plan this to be? In other words, how much of the original's feel will you maintain aside from what's impossible from the change in engine, are there any SCP's you plan on adding in that aren't in the original, and will you be adding some of your own scripted events?