Great relxaing game! The music and sound effects go very well with the game. Very fun!
I just noticed two little details:
1) When you win, you can't go to the tutorial or the settings, you first need to replay, then you can click on the two other buttons. However, this is only a little detail ;)
2) At the end, when there is only four pairs left, if you click on one block diagonal to its matching pair and then you swap it so that it is vertically aligned to match with its pair, it doesn't match immediatly. You need to spend one more move to match both blocks.
Great job!!