There's a lot of potential here, but I'm not sure how to best rate this game, I have some conflicting thoughts.
The art style is great and works well with the theme and concept of the game. Controls are intuitive, although crouching happens too abruptly for a non-action game and can feel a bit disorienting, and at least for the web version using ESC to exit isn't the best, since it unfocuses the mouse cursor every time.
The limitation is incorporated very nicely and is integral to the core gameplay loop. I do wish you could zoom in on the instructions the same way you look at screens, otherwise it can be hard to read.
It has tons of potential and the presentation delivers that Iron Lung-esque vibe, but my main issue is a lack of real direction. Do I just maintain the three stations until the timer counts down? Do I try to find a way into the area I see past the grates? Is it even accessible? And what is causing the damage I keep fixing? Is plugging the power cell into the socket in front of the gate sealing or opening it when the valve turns?
Leaving things vague does help engage the player's imagination and that's especially helpful in horror games, but I wish there was a clearer overall thread that ties together the moment-to-moment gameplay, so that I can be engaged in an overarching goal instead of putting out fires where I see them like when playing Overcooked with a younger sibling, and more visual feedback when losing would help me want to try again. It's a solid foundation, just needs to find the right balance between "vague and mysterious" and "clear and responsive".
Edit: Oh and subtitles for the ending sequence would be great too, I couldn't make out everything, but appreciate that you added some voice acting too.