What a great idea !! The retro style is stunning well done, especially in just three days.
I really think that pushing the game a bit further could give it real potential. In any case, the style could definitely be reused in your future projects.
The atmosphere, with the sound of footsteps, is suffocating and adds a great touch of claustrophobia. And the choice of controls is excellent taking time to turn is a great idea, it really builds tension. GJ !!