What's happened? You were walking in the street, suddenly someone aimed his pistol at you, and then the light went out. Now you're stuck in an underground labyrinth, whose parts can be moved continuously. The offender seems to walk around there as well, but you don't recognize him that well and you don't understand either what he wants from you. There are keys floating in the corridors, so make sure you collect them all: who knows they'll allow you to turn back to reality!
Move the little man with WASD. Use the spacebar to open or close the map. Use the mouse to select parts of that map (by clicking on them) and to move them (by clicking again).