I like the storyline and the graphics. I think the player controller could be improved, and a few bugs fixed. For instance when the lever is being interacted with - the sound effect playback is called in a loop, which causes the sound effect to play many many times at once with a slight delay. The bunker exterior door has the same issue, but the interior doors seem to be fine. I would for instance use an Interface in Unity, to define common behavior for the interactables. Also same type of doors could have a single script controlling their behavior, so you could scale your project easier (as I suspect locked and unlocked doors have different scripts). I might be wrong about this stuff, as I'm a beginner myself.