Okay, so I got to the later part you were referencing. I also had already found the locker. The problem was that I didn't realize the liquids were liquid (phrasing it vaguely to avoid spoilers) or that the main character would've been wiling to use any of them. They're too close to other objects that the main character explicitly says he doesn't want to mess with. I appreciate that this may sound weird in the context of a video game, but I think you need to use more words. The descriptions could all use more embellishing, both so the world seems more interesting and to better show what the main character is like. That would also help with trying to figure out what the player character is allowed to do. Going back to the computer example, "It's a working computer" says nothing that isn't already clear from the visuals. Something like "The computer isn't locked but it can't access anything useful" would make more sense in-context and imply activity from the main character that isn't shown.
I also think the doors could use an indication of where they are. A lot of the side passages are unclear. The stairs didn't register to me as stairs at first either. Lastly, I don't think it makes sense to call an object "loose" if it's tightly screwed on.