This is a simple “Map Editor” test I made, yes, right now the maps are just box layouts, but it is just the same as adding buildings, or enemies, or other things to any other type of game.
Simply move the mouse to wherever you want to spawn a dynamic cube. Press 1 to save the layout, and 2 to load the layout. WASD for camera movement controls. Press X key on a cube to delete it. Right click a cube to push it.
By the way, this has only been tested on my iMac, so please let me know if you have any problems with it at all.