The game is a wonderful exploration into the horror of being trapped in a room and being watched by someone you don't know and who you fear. They won't let you leave, they say you aren't allowed outside. The outside world has apparently gone to shit.
There will be four walls.
I love the art style as well! It has a crunchy Microsoft paint quality and it reminds me of how Monument Mythos on YouTube uses Microsoft Movie Maker to create rather intense horror. The simplicity of the art style helps the horror, it helps you feel unnerved. Like VHS fuzz, you see horror in the lines.
There will always be four walls.