Creative Mode is a game mode that players can use to build anything they like, and it also serves as testing grounds for the devolopers.
Creative mode can be accessed by clicking on the "Play" Chicken on the title screen, then clicking on the "Create" Chicken that appears.
Natively, it doesn't seem that all of the tiles are accsesable, as there are no barrels, or furnaces, etc. There is no crafting grid avalible either.
The ladder sprite does not appear on the game screen when placed down, but acts as if it were still there. (Ex. You can't place a tile over the 'empty' space where a ladder has been placed.)