A nice puzzle game and very well presented.
I did find it quite easy for the first 20 or so levels, it seemed that as long as you make the tiles black that have shapes in, you can always just mop up the other tiles individually afterwards, so it wasn't a big challenge. Up until the levels where most (if not all) the tiles are special. then it started becoming more of a challenge :)
I enjoyed playing it and it's a really nice puzzle game idea - great job!