The concept is really cool, I like the quantum physics-type thingy, where something only exists if someone sees it, being implemented as a game mechanic. It's a shame it's pretty short, I'd like to see more about it.
I got confused in level 4 and I thought I had to jump around the glass wall, only to find out the blinking mechanic exists which is only explained in the game description. I'd advise to put important controls in-game next time, since not everyone reads the desciption.