Quite an interesting little game. After the 7th level the game booted me back to level selection screen, so I'll assume that was the end of the demo. I had quite a bit of trouble in the 6th level and stumbled into the solution more by accident than thinking; I managed to get out of the main level area through the far right wall before actually solving the level. Starting out a level feels a lot like trial and error when you can't see the goal, or even your next objective.
I'm not really a fan of this artstyle, but it serves this game well enough I think.
Also, I liked that there was more to the first level than met the eye - although I was left wondering if the purple square had any other function besides the cool music.