It's 12 noon (yeah that's right rp) :) in an area circling a large canopy of rock which I took from my single player wad called 2drkprk.wad (sometimes found as prophet.zip). I like this one a lot and I think it rivals Prophet2. Once again, If you must have the BFG it won't be at no cost. :)
Insanity, with voodoo dolls (see second screenshot). I get the idea of a shooting gallery if that rocks your boat, but 6000 monsters behind railings- as far as the eye can see, FFS! My PC crawled when I looked towards the invuln spheres (someone said 32 k of them and you can't avoid picking up thousands at a time). In the end I cheated with god mode and no-clipping, and waded in among the chaingunners until I got bored.
Simple, clearly a first wad. All on the flat with big, brightly lit, and architecturally implausible rooms. The first map has two rooms, the second map one, and the third map one plus a kind of exit lobby. You can do one of two things - just run past the monsters and finish (I did it in 35 seconds), or have a bit of fun killing the monsters first. No noticable bugs. I hope the author will go on (or went on) to greater things.