The puzzles were interesting, and the overall game relaxing. However, I think the flipping mechanic would've been better if the color change was less drastic. It doesn't cover that the field is flipping any better by inverting the colors, and it makes the use of that mechanic in solving unpleasant. Also, the pushing of objects and their sizes was awkward in some levels. I think if the rotations had snapping movement like the vertical movement did, it would've helped both with pushing items and with not taking so long to make a full revolution.
Thanks for your input.
I actually was thinking about smoothing the inversion to something less drastic, but ultimately decided against it, as had some problems regarding user experience with it. In other words: Without a snappy change I couldn't pulled off the inversion as I did now during the jam session time.
I also decided against using snapping horizontal movement as it would substantially decrease the effect I was aiming for. (This also would partially affect the relaxing part)