In the past few years there have been released a handful of indie games which share a kind of common form and aesthetic, one that strikes a chord with me. This design space is represented in my mind by Kairo, and the upcoming Fract and NaissanceE, though it contains many more.
The quality these games have in common is use a first-person perspective and an experience based around architecture and soundscapes, working in concert to elicit some aesthetic or emotional response.