Contrast is hands down the most unique game I played at E3. It's rare to find a game that melds adult themes with the whimsical storytelling mechanics of a child's mind. Blended with interesting puzzle platforming, Contrast is surely going to spark some interest when it arrives.
You play as Dawn, a vaudeville-inspired imaginary friend to Didi, a nine-year-old girl who lives in a world reminiscent of 1920's Europe with a film noir feel. Since Dawn is imaginary, she can traverse both the shadow and the real world to help Didi discover the mysteries surrounding her family. Interestingly enough, Dawn can only see people as shadows which works out to her advantage as a shadow hopper.
Contrast is one of those games that I can see breaking ground on multiple levels, not just from a platforming viewpoint but also from a story perspective. However, I am a bit sad to hear that the game is only approximately 5 hours in length -- but perhaps that's just enough. We'll know for sure when it comes out this fall for PC, XBLA, and PSN, $15 or $20 for downloadable music + art concepts.