I'm having the same problem, kind of.
I've leveled up all my stats to 1 like I'm supposed to.
However, it only lets me do 1 reservoir.
After that, I can't do any of the other reservoirs, so I can't finish the rest of the statue puzzle.
I click on one of the 4 circles, it turns the puzzle on, so I can rotate the pipes for that section.
After I finish, get the message I should try to "do it evenly" and get all 4 reservoirs done.
But it won't let me turn on any of the other 3 reservoirs, to do their puzzles.
Can anybody help or know if there's a fix/bug?
You have to rotate the pieces of pipe in the section until ALL of the pipes in that section are connected together, to allow water to flow through them from the Reservoir to the Statue... Then the girl for that section will visit... Then repeat the process for the other 3 sections