The Tomorrow Children was one of the strangest, most unique things I've ever played. Flawed in many ways, and not what you'd call enjoyable as such, but also completely committed to putting you inside a surreal digital gulag.
Wearily stepping aboard a bus to take you out into the void. Mining some nameless ore from the inside of a giant stilettoed foot sticking out of the ground. The stern, distorted voice barking propaganda at you constantly over the loudspeaker. The need to divide labour through non-verbal means with your online comrades. All of these things were really memorable to me and it's a shame Sony went and took the servers down so quickly.
I was listening to this fairly often at the time. It seemed appropriate.