A delightful set of maps here with satisfying combat encounters (and a lot of enemy surfing), clever design choices, and some very satisfying Quad Damage action. I especially loved JCR, Ionous, Juzley, Markie, and PoolboyQ's maps, all of which I think are easily 5/5s. But everything else here is great, too, with Artistical, H4724, Greenwood, grome, Lunaran, and RadiatorYang's maps probably being "the best of the rest" in my book.
I really appreciated RadiatorYang and Artistical's maps. RadiatorYang got good mileage out of a basic (but visually impressive) map, while Artistical managed to nail a special sense of abstract "otherness" that I found very compelling.
Minor quibbles: Newhouse's Utopia has fun encounters but perhaps doesn't quite feel like a cohesive level, IMO. I also wish grome did more with their level's signature mechanic, as I didn't feel it drastically impacted how I played the level.
Definitely a must-play map pack in my book. Great stuff.
For anyone wondering: Copper 1.30's Nightmare changes work fine with the maps, although the improved Vore tracking makes some of the Vore setups across the maps much less forgiving. The respawning Zombies can make some areas slightly too hectic, too. Nothing insurmountable, but worth mentioning anyway.