Loved the atmosphere! There was always this uncertainty of whether or not whatever was outside the bunker was going to break in or not, which made for very tense feelings. I really enjoyed the simplicity of the gameplay too—in horror games, feeling stuck on a puzzle or something really breaks immersion in my opinion.
My only qualm is that the endings feel like they could've been more fleshed out. Like, the endings feel a little too simple (unless you were going for simple endings so the player has to interpret what happens?).
Overall, great job! Looking forward to whatever new games you'll release :)