What is the dinosaur game made from Blitz called and where can i download it?

There was a game someone made on the old Blitz Showcase that involved your character seeing a showman reveal a living dinosaur, but your character doesn't believe it. eventually you become trapped in a maze, and you have to find a key, and unlock the door out. but the dinosaur you saw earlier is also hunting you down. you had to get out before the dinosaur finds and eats you. the game is played through a first person perspective.