Interesting puzzles. Simple controls, but challenging. In the beginning I was a bit confused on how to drag tiles, maybe making them move by just dragging without needing to release would help. Or an indicator on where the tile will move while you hold down the mouse. Also I think it would be cool if the moved tiles would stay as they are when you fail a level... Sometimes I failed and then had to redo everything, even though there was just 1 wrong tile.