I see this is an indoor water park. Does that mean it is open year round?

Yes, and no. Open all year, but only every day during peak season. Once school starts, it is only weekends really

Open year round and it is indoor. It can feel cool inside on cold days, but get in the water or go to the second level for increased warmth.

I believe so

Aside from the kids play structure water was cold

Yes

It was cold out when we went, and it was not too noticeable inside- none of the children complained