For normal instructions, look at the instructions of the original. To access cheats, press b, and wait half a second. To toggle it back off, click b again, and it will reset all cheats. Once cheats are enabled, space will take half a second to work, and then will remove the minimum and maximum limits of the hammer, and to disable it, press space again. Once cheats are enabled, wasd, or the arrow keys will allow for vertical and horizontal control. And no, there is no no clipping, because I am too lazy to go through the physics engine.
Originally by @griffpatch. Cheats made by me.