Really elegant use of the theme. When the levels get tough, you really start to dread falling out of the colourful zones. The awkward controls for jumping in the unsafe space was literally painful at some points - which maybe doesn't seem so good? But it definitely gave the right effect, so I'm all for it!
I also really appreciate that you can't even tell what your own colour is until you're in a safe space. The sort of colour masking effect of the safe spaces looks really neat too.