Co-op would a antithesis to entire design of the game. Thw unique control scheme is central to its story. Two sons is a great single player game to wrap your head around what are fairly basic puzzles, but having two players would just be bland and generic, It was never intended for two people, and to make remake it as on would essentially be making a entirely separate game
Meh, I want to play it with my daughter not write a thesis.
To be clear I just wanted the option to play that way, not for it to be the only way to play!