Fantastic visuals and great light tech (how many rays do you cast per light source, if you don't mind me asking?). I enjoyed the tutorial levels, they ease you into the game quite well. Very thankful for the controller support, it felt a bit better than using the keyboard.
I like the overall action puzzle mechanics, and I didn't have much trouble differentiating the triangle from everything else, though I can understand how that may be an issue. Levels seemed to be out of order - last level was much easier than the previous ones, even though it looked much more menacing. The "sightlines" level seems to have an extremely tight opening for the player to move, dunno if it's intentional, but it kinda registered as "impossible" in my head at first.
I liked it a lot.
Also, rotating squares are pitch black, but the game is called "Rotating squares OF light". False advertising much? 0/10, lights were not rotating.