SCP-087-Remake Horror

As a test subject (class D employee), you are sent to investigate the object with the number SCP-087. The game begins with a dark staircase, the path along which is accompanied by horrific sounds. A lot of interesting puzzles with difficult solutions will come across your way, as well as monsters eager to grab you.
Each step passed can be the last. There is an exit.

The game itself begins like all of SCP-087 but when you descend the stairs, an unexpected turn awaits you. Door. In which you can get by typing the correct combination. While you are solving this puzzle, you can be attacked both from above, descending a thin thread, and from below, climbing stairs ...

Spoilers
Flashlight = Your friend and fear. Sometimes it is needed to scare away the monster, and sometimes it is better to turn it off so that you are not noticed.

Having found all the secrets, you can really find a way out of the nightmare.