It's a good puzzle.
I liked the idea and implementation of color switching (although pure blue seems too dark).
It took 9 minutes, and 1 restart (at a level where I had to think outside the box).
Simple and good one.
Thanks for the feedback! I was worried that both the blue and the unlit states would be too dark, and I think it's worth rethinking those based on your feedback and some of the feedback from others.
