I think it is an amazing job what you did here. All the PS1 details, like the camera, the player the movement, or the scene transitions, are great and are well placed(the puzzle and the gun too) . But for me it's really outstanding how the ambience tell you a story and how claustrophobic make you feel while you are walking to the unknow. I felt the same way as a kid when i played "resident evil nemesis" years ago (pure nostalgic) and if this is the experience you want to transmite, you did an amazing work.