Thanks for all the comments. =D
@corysykes: I'm not sure what to do about that at the moment..I'll see what I can do about the sky texture thing. And about the imps, you can just rush them at the start, they aren't that big of a problem. You have a wide-enough area to run around in.
@Wills: I'll see what I can do about the blandness and the emptiness. And about the flesh stuff, I was trying to make it seem like it was on it's way of being taken over by the demons, and that's where the blood-puddle monsters come in, they were part of that invasion. They won't be in every level, don't worry.
@NewTiberian: The blood monsters only do a ton of damage if you are right next to them when they die, the blood that flies up and then comes down does damage.
@Phobus: Thanks for the comment, is that a question about the monster placement? I'll see what I can do about it.