Holy heck, those puzzle solutions must've taken a while to design!
Might be a tad bit too difficult from the get-go, would have liked to have some easier levels such as the first one to get into the "vibe" of the game. It also took a while for me to understand that I could push multiple pipe-pieces at the same time. Would have been nice to have some kind of tutorial on how the mechanics worked.
Presentation-wise, really solid, loved the water effect, it felt really satisfying to see it all get cleaned up :)
Huge props to the puzzle designer!
Great work :)