Loved the aesthetic and the atmosphere! The music is soothing and the sound chosen fit well into the game.
The puzzles were simple but I agree with other people here, that the "unreal" boxes should be clearer to distinguish from the real ones.. like having no collusion for example. Adding to that tho, I liked the idea of having "unreal" puzzles which can be essentially skipped, but I would personally remove the possibility to genuinely solve them i.e. being able to open the door with the pressure plate. But I assume you had a reason for that decision.
Adding to the criticism of other people here regarding the instructions: Yes there most definitely needs to be a possibility, after you experienced the instructions of the narrator once, to skip it in the case of you dying. (And yes I did jump into the lava pit out of curiosity lol)
The visual presentation was simplistic, which works well here since you are in a testing facility. Gives me the feeling of being just a trapped guinea pig. One of the things here I really enjoyed is the way you presented new sections of the rooms or parts of it by just glitching out walls and stuff. Really liked the effect on these transitions as well.
My main drive for playing the game was my curiosity to how the story would end.. what would happen to me. Gameplay can most definitely be improved upon but all in all and considering the time in which this game was developed, I say this is a solid entry. Well done!