I LOVE this game! Very creative and fun. It can be really hard at times, but that's kinda the point, so it's okay. One problem though, I think that puzzle 4 is broken. When move the two top tiles, the red outline thing moves off one tile and on to another! Then one tile has none and the other has two, one of which can't be seen in the grey scale format (without the lens.) Other than that, great game!
I so far have solved 1,2,3,5,10, and 13.