Minecraft has shown that games focused mainly on building stuff are appealing to a lot of people. Bokida, a prototype game designed by French students, is similar in that you can put together your own little structures using the provided tools, however, there's something oddly calming about the whole experience, which sets it apart from other physics toys.
Maybe it's the lack of zombies or other threats -- you're free to just roam the white, cel-shaded landscape, fashioning blocky green architecture out of thin air. You can use your building abilities to reach otherwise isolated locations, or you can destroy them by slicing them up and blowing them apart. Cut blocks turn red, while "pushed" ones become yellow (see image below).
The fact the you can chop your creations up so precisely shows just how far we've come from the likes of Red Faction and its "Geo-Mod" tech. Bokida was created by a "small group of French students" with Unity, according to IndieGames, which only makes you wonder what a larger team could do with this premise.