@Manuel: Not sure I understand what's going on there. Is there some significance to the colors of the blocks?
Sorry for the late reply. :c The level's goal is to get the card and get back to where you started. The character walls on the blocks to get the card and, when he gets it, the blocks that were walked before disappear. I'll make some improvements to it, so that it gets less cryptic in unwanted ways. (like adding ghost trails or fading by a bit the blocks that were touched instead of killing them)
This mechanic is tied to a narrative, so that might explain why that .gif was confusing. Hopefully the improvements I mentioned will fix that.
The color choice is cosmetic, at least for now. I'm setting up a random hue to each of them.