The atmosphere of the game is disturbingly scary. You did a great job with the environment, especially the lighting, the room’s composition, and the texture of the objects. In a way, it even reminded me of some titles like Outlast, probably because of the feeling of helplessness it conveys.
The game’s main concept reminded me of the Backrooms, mainly because of the hostile creature (Slenderman?) that appeared right behind me when I tried a number combination on the lock.
The room’s puzzle is quite interesting, but the way it’s laid out makes it seem like all the clues are on the walls. Thanks to the gameplay footage, I was able to figure out the correct order and finally reach the ending (I assume we die in every outcome, right?).
While playing, the only thing that broke the immersion a little was the mouse sensitivity. In a horror game like yours, it’s essential for it to be smooth or even subtly slow, depending on the pacing you want. In the current version, whenever I touched the mouse, the screen moved abruptly and very quickly.
The game is short, but it has a very strong concept. You managed to explore horror really well, especially for something made in just 20 hours. Congratulations on your effort—you did a great job. I wish you success as a developer and good luck in the jam!