That's a good observation. I think there might be a way of doing it, like if instead of turning them on and off individually you could have it so one is always turned off, so it would just be one button. That would be easier to keep track of for sure, because I don't think there was ever a need to have both turned on at once.
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Yes, that is actually what we came up with as a possible solution too! There were also many times during the level design when I was very limited because all blocks could be just on the whole time, but switching between two would not only help with controls but also unlock various other interesting level ideas that I had to scratch.