So I've been playing the Sideway demo and I got 4 out of the 5 secrets. There's a certain platform I can't reach, and nearby there's a special platform which I can't stand on, but glows when I jump over it. Here's a screenshot in which I added an arrow indicating the unreachable platform and a circle around the glowing platform (since Nox is currently "over" it, you can see a faint purple glow there, otherwise it doesn't appear):
(I've also added a "graffiti" tag of my own, just to stay loyal to the overall feel of the game)
What is the meaning of this glow? Is there any way in which I can activate this platform? Alternatively, is there any other way to reach that unreachable platform on the left?