My recommendation is to just go through the levels in the beginning. Even if you dont pay attention you will probably get the required 32 cubes to get to the last stage without any backtracking. I would start worrying about decyphering the hidden alphabet / codes on New Game+ (also, not to spoiler, but in new game+ you get a new gameplaymechanic that is essential to most riddles)
Also, regarding the Xbox exclusivity:
https://twitter.com/Polytron/status/225746712692662272