Nice, I really like the gameplay and atmosphere as a quick experience. Took me a few tries, but I managed to earn the privillege to sacrifice myself for my glorious company. Joke's on them, though, because I managed to escape my situation by clipping through level geometry near the tanker afterwards, thus escaping on my own terms.
With that, here are a few bugs I noticed, if you want to continue working on it: Firstly, some of the turrets seemingly randomly didn't work properly. I checked that they were fueled up, and they were, but they didn't seem to shoot at all. This also sometimes seemingly fixed itself on its own - maybe I missed some mechanic behind the scenes? Also, at one point, enemy spawning just stopped for about a minute or so, maybe two, and I wandered through emptiness, already thinking I might have to restart, but it suddenly picked up again. Actually got a bit of a spook out of me, as an enemy had spawned behind me and I turned around, already having got used to everything being empty.
Overall, really great, especially the atmosphere. Good job!