Excellent execution.
Good storyline, narrative. The mission is clear and it makes sense.
Artstyle good. I didn't make it too far. I managed to kill the first boss.
It starts to get a little creepy at some point when the colours get greyer and there is corpses lying aroudn all over the place, so I chickened out xD just kidding-, but I died once.
Anyways. I have one thing to suggest for improvement.
At the beginning I took some time to figure out I had to get the plasma gun and then run all the way back to destroy the boxes in front of that door.
To get through it. I didn't even realize that it was a door at first, as there didn't seem to be anything indicating that it is (or I'm just slightly dumb)
Overall expert job!