I was so disappointed when I found out that this wasn't another in the "robot wants ..." game series. I love the series and I'm waiting for the next part. This game should be renamed, to avoid the confusion
What I think would make the game more challenging, is if only the glass containers had to be filled fully.
As it is now, all of the water always fills the glass containers and the in-between reservoirs completely. It's possible to just fill in the blanks between piping blindly and eventually you will hit the right combination