Here's what i found after a quick try.
Double Double Damage
Might be interesting but from what i can tell they don't stack with each other
And on the attached images you can see a couple of places where there's only the default texture. Hope that's not a cooking issue.
Lighthing is shaping up very well, there are some bright spot on some static meshes but i'm sure you're already aware of those. As for the narrow doors, they are much better now, but they can use some more blocking volumes: try to envelope both sides of the hallway with a single huge blocking volume, that way you'll never get stuck anymore.
Make sure to add them around the teleporter on the upper floor, so that you don't get stuck on the wall decorations if you happen to appear turned against them.
Last one: why don't you scale up the jump pad a little bit? I think that would help both visually and gameplay wise. Visually because the floor will look a little less empty, and gameplay wise because you can hit it more easily since it is so far from the wall.
Keep up the good work