Wilfred's Wonderful Waterpark

The protagonist Greg Marley and his brother Tom Marley decide to take their saved-up money and put it all together to go to a waterpark during the summer. This waterpark happens to be Wilfred's Wonderful Waterpark. Upon arriving the brothers are having fun; the place is great. But then all of the sudden Greg's brother is gone, nowhere to be seen. Then you start noticing the people in there are subtly going missing too, until you're the only one in the building. Then in a desperate attempt to leave you dash towards the front of the building only to realize it's barricaded. You try and try to break through, but all attempts are wasted. Now you're stuck in there and Wilfred is monitoring your every move. Eventually after giving up and going down slides, the player notices a slide that was never there before. He's intrigued so he decides to go down it, only to meet Wilfred on the other end.