Here is my blind playthrough =D
https://www.youtube.com/watch?v=f1u1srAfahk
For a map with small/medium size, this level packs A LOT of enemies (145 in hard mode, not 155 as the readme says, i think if you are not using the fish-correct-counter-patch the counter says 155), which brings some pretty good fights and dangerous ambushes =D
SPOILERS: I found 4 of 5 secrets, then i quickloaded and nocliped a little and was able to find the last one. I also found 2 spawns hinding in a secret area that i already had visited and 3 zombies just standing below the map (i don't know what they're doing there) :P
Thank you for the ride :)