I somewhat played all the KH games and I'm fully updated on the story. I know what happens in the game, the ending and the story and such. Is the game still worth getting gameplay wise or should I just skip this one?

 

I'd say it's worth getting just because of how much fun the gameplay is.

It's still a fun game to play.

Dream Drop Distance is incredibly fun, and even though I knew the story going in, it still felt good to see it unravel on my own screens. Not to mention you can do what I do and occasionally turn on the game just to watch the opening cutscene