I was stuck in the Ice Maze, I got the two items from the labyrinth but it was not clear what to do next.
However, the idea of them stuck in the world of a film is interesting. I agree with the feedback left by miracleJester and Colin, in my opinion if you want to develop a longer version then the best you can do is identifying the good parts of the game and focus on them. For example, you could plan the story overall, and once you have the sinopsis then you could start working in the level design and the story's script.
Keep practicing and learning about game design! I am trying to learn too, it is not easy but someday we will become better.