Omg I love this main menu :D Its a perfect placeholder version of UI for prototype stage of the game.
About the game, I stuck, doesnt know what to do. Doors to toilet do not work.
I do not know what is unsen, perhaps because I didnt progress enough.
Glad you liked the menu.
To get into the toilet you need a key. Gather all journals for a clue
What is unseen is the mental state of Mikael, the character who lived in the house you are in in the game. No one saw his suffering. That is what the journals are about.