First of all, I really loved the Idea with connecting the pipes instead of the pieces. Sadly tho that in the end I didn't really felt the urge to do so rather than just connect the ususal pieces. I understand that u need a way to maybe get pieces out of the way that arent needed but for me it felt like normal Tetris in the end. Doesnt mean I didnt enjoyed playing your game. I did enjoy it and I hope you may learn out of it so that u do it better one day.
Plus props out that you did it solo. 👌