Hear me out...
Half of this movie makes for an interesting video game concept. It would be an Alien: Isolation-style video game where you are a recently betrothed who has to survive and escape this giant mazelike cavern where a dragon is skulking around. You're doing this while avoiding pitfalls, traps, and other small creatures and oddities that can harm you.
However, there would be an online feature in the game where other players will leave helpful messages (like a souls game) and you each help map out the cavern together in order to escape in your own game (Yes, this soulslike feature was in the movie). Or they can make this feature offline as a roguelike where you can do your best to remember and map out the place before your current character dies, taking what you've learned to the next one.
In order for this to work successfully, there will be 100 different variations of the map, which means you can't easily rely on an online guide and instead have to rely on messages and mapping. Other than the main mode where you have to escape, there can be other modes (like escorting a civilian out) to help provide a bit of variety. The game would be a graphical and raytracing showcase, along with a potential clothing-tech and hair-tech showcase as the dragon could burn the player at any moment.