Really clean game ! Quite self-explanatory, although I didn't quite understand why sometimes the blocks can overlap and sometimes won't... But really a good concept, congratulations !
If you have time, could you please play and rate my game ?
You can't put pices on top of tiles from their same color, althogh rethinking the idea I realice it might have been a bit confusing. Thanks for your comment, and yess, I'm playing your game right away!