Build It

WASD to move Front, Left, Back and Right. 

Q to move down and E to move up.

Arrow keys to change direction of view. 

L to hide cursor, allowing mouse to allow for changing view. Tap L again to show cursor, lock mouse view, incase you need to close the game. 

Objects will be spawned where the cursor is, in 3D space. On tapping X, the cubes that are intersecting with the cursor will be deleted. 

Have fun and let your creativity flourish.