Wow, I love this module mechanic, makes it a weird, but really interesting puzzle.Although, I think there could be room for other kinds of modules than just movement, like a ray module than power the cube with electricity in the form of some kind of ray, proyecting it to the side that you put it, and powering wathever is on the way.

I don´t know, maybe could add ideas to extend a bit more the game. But by itself is really great.