Yes, we went there last week, its not worth 100 riyals and a day. starts from 2 pm to 10 pm, if you are a Facebook member you will get a 25% discount on some days.
there are only 5 or 6 rides, only one of them is really thrilling and they stopped that ride by 4 pm that day without any reason.
also they wont allow adults to accompany kids in the kids area even if it is a toddler, but kids can ride on adults rides even if the kid is shorter than 121 cm.

Also we heard that they are going to stop the functioning for 4 months starting from id.

I suggest you check their page on Facebook before making a trip, there are specific days for families, ladies etc...