Here is a mock up video of a puzzle utilising the future 'shadow' mechanic, whereby in certain special locations and circumstances, shadows adopt a physicalised nature.
In this video the player is represented by the green stick figure and the puzzle mechanic, in this case, is demonstrated using an elaborate two stage 'zelda esque' block pushing puzzle.
A modified version of this puzzle, along with other puzzles based around physicalised shadows may be implemented in the future.