/vr/ - Retro Games

So I got in contact with the mapper behind the DemonSteele level screenshots, and we've been doing a little bit of a discussion.

Now, let me preface by saying THIS IS NOT A GUARANTEED THING. We remember what happened with the attempted Metrood levels.
But at the moment we're discussing a mini-campaign for DemonSteele, to help address all the "what the fuck do i play demonsteele with" questions and cement what kind of map flow really compliments the gameplay.
I had a lot of fun doing the level for the NES Zapper mod and he's already got a level finished. So I figure if we keep it small, maybe four or five levels or so, then we've got a real chance of making it happen.

So, like always, /vr/, I'd like to hear your thoughts.
What sort of environments do you think would work really well for the \m/ METAL \m/ feel? What sort of maps are you finding contributes the most to the gameplay? Anything that you're finding you especially hate to wade through?