Nice implementation of the theme! It looks nice and plays well enough with minimal bugs during play (there were a few that didn't impact gameplay which is great for a jam game).
It was a bit hard to tell what was what at times, and where you could go at the start, but after a few tries you start to recognize better paths and the best way to get out with the enemy spawns. I liked that there were different paths to get into and out of rooms.
Art looks good, but may be a bit too dense for a fast-paced run away from alien horrors making it a bit hard to figure out what things are sometimes. I kind of wanted to just look at all the various cool machinery, but I had to run from the monsters!
My biggest critique is on the gun. Having two separate resources for it felt a bit too restrictive, especially when making a mad rush past a large group of enemies, though I figure it was done to promote more careful, sneaky gameplay.
Overall, a good entry with nice art and solid gameplay with a cool theme of enemies arriving with the darkness.