Interesting game. I found it hard to distinguish when the switched blocks were ignited vs extinguished, because 'extinguished switch' base colour is very close to the 'ignited block' colour. When a switched block is lowered I can't tell at all, even if next to a ignited ground for comparision.
Also in Level 11, most colour layouts make the white and green switched tiles indistinguishable because the green gets washed out entirely by adjacent light. When the blue switched tile is in lower left, the other three all appear white. This is without colourblindness and on a screen with reasonable colour rendering.
Thanks for playing! I've taken your critiques on board and will be looking at making the colours more distinct before the jam submission deadline. I think part of the issue is that I was forced to change the colour space settings from linear to gamma for the Web GL build which may have screwed up the aesthetic a bit.