As someone, who has no clue about the SCP-087-1, I enjoyed the game for what it was, yet I did feel the lack of atmosphere after a while.
The game is well made. The execution, levels of detail, ambience, the sound design - superb on every single gold level. I enjoyed the movement and the flashlight as well as the design of the stairwell. After I've played the game (did not complete it)I did watch the short video about how the game was made and to be frank that entertained me more than the actual game.
I've seen SCP-087-1 games, a lot. Again, never played them, but from what I gathered some of the "clones" are pretty much repetitive and this game, unfortunately falls under that category. After a while, I felt the lack of eeriness, the atmosphere felt underwhelming and the scare of the "face" did not affect me at all.
In the end, there is a huge space for improvements. I think the game has a huge potential of making more in depth dive into SCP-087-1 and I am all here to support it. Great job developer/developers. Best of luck to you and your future projects. Cheers!