Nice puzzle idea, great puzzles. However the difficulty level was all over the place, some early puzzles were incredible hard, some later ons incredible easy.
My biggest problem is the black blocks, they should be visible from the beginning.
But there were also some bugs.
Like someone mentioned before, it happens a lot that they are being placed on the wrong spot(but i don't see why he mentioned you would have to restart, i don't have to, you can just pick that thing up again)
Another bug, that sometimes it says level finished, even though you didn't solve it.
And a bug, that you can place the color thing on a stone and then place a nother color thing on a stone that shines on that stone, but not the reverse, i.e. you can't place a color thing on a stone that is already colored. Which i guess is the point, but those it also shouldn't be possible to place a color thing that shines on another color thing. ... hope you got what i mean.
The graphics were nice, but "inanimate geometrix object with a smily face" is being used way too often, and it's just a very cheap method of "look kids, they smile! Isn't this fun XP!!!" oh please, kids are smarter than that, especially if they are on newgrounds, not really a kid-friendly website