Update after few hours.
I had a lot of ideas for the theme, and tested a few.
changed my mind after realize that most of them was crap.

Now I came up with a kind of hide’n’seek, inspired by gary’s mod.
Basically, you need to search for others which are shapeshifted into objects in the room.
Don’t know if the game will be fun at end.
But I really liked the idea.