I have been there several times and I also want to say that the water is icy on the big slides, which is not very comfortable.. Slides are good in principle..
Although the water in the children's pool is warm and so is the water in the slides)
The water park is very good, I counted about 11 slides, no less. The staff is very cheerful and sociable. I really liked the slides: whirlpool, dark orange and blue open (which is on the penultimate floor)