The physics were quite wonky at times sending the cubes spinning with a silly amount of speed, but that wasn't a problem. You can kind of prop-boost like in Portal. The puzzles weren't difficult. On the section with a room that has two sections and two long blocks, the right part of it when you first encounter has no use? You don't need the either of the beams, just get a cube from the previous section. The rotate didn't seem to work? Not that it was needed when you can scale it very small or big. Fire music. A better indication to when you are holding a certain cube, not only on hover would be useful. I guess the fog is part of the aesthetic.