Summary: Linger in Shadows is a hauntingly beautiful, albeit extremely short, demoscene art "game". I think this fact has fallen on blind eyes with many reviewers here (professional or otherwise). It isn't a demo as in a video game demo, and it's not a game or tech demo of the PS3. If you expect it to be any of these things, you will be confused. Do a Google search for "demoscene" to understand the culture behind this art form.
Summary: Very good art direction and music. If you dont mind paying a few bucks for a fascinating 10 minute little art show and a few trophies absolutelly try Linger in Shadows. I wan to see more releases like this.