A game that looks what you know from demo scene games: Repetitive geometry that builds up, animated to sound or other events. An ever changing Environment. Would be a lot of fun to solve things in such worlds.
Would be very visual/emotional, could be more linked to art than to games.
keywords: blocky minecraft, raining boxes that damage you, but if you found shelter, you can walk on the new landscape, like stacking snow. great physics, blow dozens of boxes through the world. monsters that are assembled of many world pieces they have eaten?