I thought I'd give these maps a go.
Pedro vc wrote:dark as fuck
You got that right.
Some almost all areas of the maps were practically pitch black 48 map units out. I played the maps on a combination of Legacy and Software rendering. I tried your suggestions and they didn't seem to help either. As a few suggestions, maybe try using sector brightness higher than 120, brightmaps to help point out details in surfaces and monsters, adding dynamic point lights to things, etc.
The atmosphere was top notch. Some of the rooms in the map, with the combination of the music, were really great in setting the mood. In some areas, the colored lighting really brought out a terrible and dark feeling. I really liked that camera room, as well. The new sounds of the weapons were perfect, and the demon sounds (especially ROAM) were fantastic.
The monsters were a hit or miss. The lesser demon replacements are fine, but the Cintaralho is a miss. It is simply a bullet sponge (2666 health) and the pulse attack making it invulnerable is cheesy. I don't have a complaint about the Octotron ("meatball"); that one is simply amazing.
As far as level design/flow goes, most of it was tolerable. While the maps themselves look great, it is easy at times to get caught on sector details in the sudden monster-closet traps. Fighting 24 imps/pinkies flooding in a tiny room is not exactly fun when there's no room to back up or kite them and your player keeps snagging on floor/wall detail. The underwater segment was really interesting, and I wish they were used more often in mods. The switch hunt feel of some parts distracted from the atmosphere. Maybe some indication or hint text as to what a particular switch does? Mandatory secrets are also very bad, for instance the wine cellar area of MAP02 or the second floor bedroom in MAP04.
Overall, the maps were pretty great and the multiple endings was a nice touch for replayability.