great game
It was maybe a little too easy... I'm not a very good gamer, but I just kept going. But it was fun nonetheless. *I love these pipe styled games.
The only thing that I would suggest is that your "how to play" is not very informative. It doesn't explain at all what the goal is, or how to rotate the pipes... it's not hard to figure it out, but if you're going to include the instruction, might as well make them a little more detailed.
That's it... I thought it was a great little game!