This is a cool take on Tetris. It took me a bit to figure out all the shapes, but once I did, I could see the similarities. I really liked that you didn’t just change the shapes of the blocks to pipes, but had the pipes carrying water be an active part of the game. Trying to connect water from the bottom to the side outlets adding an extra layer of strategy that was a lot of fun. There were several times where I had a piece that was the right shape to fill a spot, but the pipes were the wrong way to connect water, and I had to make the quick decision as to whether or not I wanted to place it there.
I liked that you had multiple music tracks and that you could switch to a new song if you didn’t like the current one or wanted to listen to the last one again.
It would have been nice if there had been a fullscreen option. The game was completely playable without, everything fairly clear to see, but I do think it would have been a nice touch.
I also think it would have been a cool touch if you got an extra point or a different clearing animation for clearing a row that had water flowing through every pipe. Even though I knew the bonus came from connecting the water to the side outlets, I kept wanting there to be one for connecting water in every pipe in a row as well. It did look like there was extra bonuses for how many pipes the water went through when reaching the outlets, though I wasn’t 100% sure exactly how that worked.
Tetris is one of those games I tend not to get very far in, because I start to get a little bored with it. You did a really good job giving it an interesting twist that made me want to keep playing longer than I normal play Tetris games.