I glad I bought and play this game. It is a very unique game with a good story.
The story starts right after the events seen in the last movie. During the game, it usually mentions part of the pasts. The story develops in 1931 when Marty is looking for Doc after months of being unseen. The dialogs and story develop very clever, no very deep but very good enough.
There are 5 chapters. Each chapters may last 3 hours, I mean it is a lot shorter but usually during the game you get stuck for several minutes (maybe hours). However, it always unstuck after trying several things (some unexpected).
I liked how the game progresses and how it ends. I mean, it may be ended better but it was good enough.
Graphics are the week part. Even though, the game is a good representation of the movie, the graphics and environments are very simple.
You can get the Platinum trophy in this game, but maybe not in the first game through. I didn't work on getting in but inventing like 3 hours more I could get it.
If you like the movie, it is likely you like the game.