Update list:

[*]We changed the light's mechanics. It became completely dark.
[*]Monsters cannot open the doors
[*]Added death mechanic. Now the player falls down? after that an inscription appears at the end.
[*]Some doorways have become wider.
[*]Added a new character who will try to scare you.
[*]Fixed mechanic of test rooms.
[*]Fully voiced Russian, English and Chinese versions.
[*]Bug with loading has been fixed.

Regarding the big free add-on to the game:

We are now fully focused on developing the new DLC for Sogo Vego. The plot will be twisted around the characters of the game and presented through the eyes of Mishka (one of the game's antagonists).

The new DLC is associated with a period when there are no players at the base. Bear, Monsters and Tester must prepare a base for the new arrivals, place keys and notes in their places. Most of the work will be done by Mishka. It seemed in a simple task there are pitfalls that you have been stepping on from the very beginning of the add-on. The monsters do not want to help, so you have to contrive to achieve the goal, but you need to be careful, as the Mishka can die.
The expansion will be less about intimidating the player and more about character interactions with each other. Add a tablespoon of adventure and a teaspoon of humor to that.