This is a discussion forum. People are going to debate positions and potentially disagree with the things you say here.
There are certainly plenty of characters. You probably don't need to cover the story of the movie - you can just immerse guests in the environments. Off the top of my head, you've got the restaurant's entryway, the arcade, the performance space, the kitchen, the security office, the back-of-house hallways, and the storage/animatronic repair room. That's at least seven scenes, and they'll probably revisit the performance area and/or arcade areas in a more distressed/chaotic state. Toss in a scene or two from the video games (or take some liberties with the back-of-house areas) and you've got a ten-scene house.