I liked the world and some of the puzzles. I was able to to find book #3(?) and I was able to spot book #1 (I think?) but I couldn't figure out how to get to it. I did enjoy the water puzzles!
One thing: it was a little difficult to tell where I was in the world - maybe something like a minimap would help?
Also where is book #2?? I spent a bit looking for it but I couldn't find it haha