-visual changes of the lab area in terms of lighting and reflections, notable difference — the tile walls now have phong effect
-the vent shaft now has two routes leading to the lab area instead of just one
-number of zombies decreased from 7 to 6
-various optimization changes
-various ammo and weapon pick ups changes
-the lower platform with the barrel drums was changed a bit (the barrels were moved around, now there's a small platfrom on top of the hallway that leads to the labs
-some pistols would be stuck in the air even after pushing away the desks that were under them; fixed

Some quick fixes:
-further reduced file size (I deleted a few high-resolution cubemaps, it shouldn't affect the visuals much)
-added some additional weapon spawns
-the turrets were nerfed, now they have lower attack range — they don't attack unless you walk into their blue scanners
-the number of zombies is lowered (from 9 to 7) and their placement was changed a bit

First big update. You can see some of the changes by checking the newly added screenshots with yellow captions

-various optimization changes. This includes the file size which should now be lower (from 76 MB to 69 MB)
-lighting changes. Fixed overly bright lights, some darker areas should now be brighter (mine with skeletons, metal platform above the lab entrance)
-the windows for the reception room are now breakable (including the wooden panels)
-the lab section now has a turret control area
-visual changes: added dust particles for the surface area windows, added windows for the stairs leading to the next floor, added smokestack in the non-playable area
-fixed messy info_node placement (there were way too many unnecessary info_nodes)
-the fast zombies are now spawned more spread out
-added more verticality (higher ceiling in the offices, bigger metal grate platform in the rusted corridors, 2-storied turret control area) and additional routes (the afromentioned lab area, new laundry room, vent leading to the lab)

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Initial addon creation.