Was there a purpose for the cube that had to pass those 3 light bridges? I finished the room without that part.

That was pretty good, nothing too complicated but it had a fairly good variety of mechanics to keep it interesting and it had a good central concept. Couple of improvements; cubes always need droppers, if a cube gets lost or destroyed accidentally, the chamber becomes impossible to solve. Also, two of the light bridges are unlabelled, admittedly it's relatively clear what they do but antlines/symbols help to keep the player informed and give the chamber a logical consistency.

I've got a little collection of chambers going and I'm always interested in feedback on each chamber or the collection as a whole. I'd be grateful if you'd have a look:
Elementary