Left click with mouse to smear, hold T to use stamp mode, hold G to use delete tool, arrow keys (up and down) to resize, arrow keys (left and right) to rotate, hold Z for other options with arrow keys (left for circle, right for square, up and down to change colour), A and D to move, space to jump, hold F to use flame tool, B to change background, hold S while pressing space to hop down from something.
By me, no-one else, really. Media Molecule made the original two games (LittleBigPlanet and LittleBigPlanet 2). Sorry the physics are buggy but its my first time making left/right physics and it doesn't help that I'm doing it in a LBP create mode remake.