Thanks for the feedback. You are right, the levels should have had more variation. I had a lot of ideas for each level, but ran out of time. I spent too much time on the visuals, so that's a lesson learned. Good point about the colors. I was actually considering making the pieces more individually recognizable by shape or content, in addition to color. This was mainly a color blindness consideration, but good point about f.lux, hadn't thought about that.