Why, we do love our abstract exploration games over here at Castle Shotgun. We can never resist their colourful allure. But here's one with a dark twist: The mighty Indie Games leads us to student project Paradis Perdus, by Sergey Mohov, Fabian Bodet and Matthieu Bonneau. They explain the concept: "Paradis Perdus is a game of exploration and contemplation, except the time is also of essence, since everything you touch gets infected and eventually ceases to exist."
Links to playable builds (OSX, Windows) here, and there's a video below.