Hey there, I tried it out and have two suggestions.
First is technical: your thumpin' background track is very crackly in chrome.
Second is I seem to be TERRIBLE at your game. Perhaps a ramping up of difficulty would be helpful. The first thing I was faced with looked like it needed 3 irregular shapes to make it, and my mind just froze.
Third: I couldn't find a way to un-place a shape. So I had to suicide anytime I messed up at all.
I suppose I can't count.
Good luck, and the concept looks great!