Not bad. A lot shorter than I thought it would be. The gameplay is a mixture of KH2 and KHBBS. Graphic's amazing. The map felt big in the Castle of Dreams then it gets smaller and smaller so it's a bit underwhelming.
Even though I played it on the Japanese version, I was able to understand the story without knowing what the dialogue was, probably because of the previous Kingdom Hearts game, but it's refreshing to see a game that has the ability to tell the story through visuals rather than just exposition but I kinda find it annoying that Aqua talked to herself a lot. I'll probably find it annoying in the English version as well. The game doesn't really stand on it's own, you have to play the previous Birth by Sleep before you play this game.
The games is about 3 hours long. It plays on 4k 60fps on the PS4 pro, not sure about the base PS4. I give this game a 7/10.