....you know I'm thinking it's maybe too late at night to try this out now, so I'll leave it up to you to work out whether it's worth staying up for. The original, Deep Chalk, was described as "not a game but an interactive piece of art with an objective: to discover its secrets and escape" (from JayisGames). Second Phase "is the continuation of the journey of the crystal, the player character in Zack's black and white world. The objective is the same: discover the secrets hiding beneath the surface and escape. While you're there, enjoy the quest; be inspired."
Play Deep Chalk - Second Phase here