Had a pretty good time with this map. It's a bit visually flat in places, but it follows a really satisfying linear arc—start in the slimy pits of the bog, surrounded by bridge foundations and zombies, and slowly work your way up, criss-crossing periodically through familiar spaces. With different presentation and a bit of narrative flourish, it would have a very Half-Life sort of flavour to it.
There's a nice blend of solid fights and gimmick fights here—the map tries some really interesting ideas in between some fairly standard arena encounters, and while I don't think they're all winners, I appreciate the effort to mix things up. The final fight in particular does something really fun with light and shadow, but I burned through the bulk of the enemies in it so fast that it felt like the concept didn't fully get a chance to shine.
Overall, well worth the time. Really looking forward to seeing more from this author.