Anyone think Kingdom Hearts Re:Coded is hard?

Well, I just got this game Sunday, and it is pretty fun, but annoying. The bosses i've done so far come back to life out of nowhere or have a twist to it and then there's trouble at every corner unexpectedly. So its kinda hard to be prepared for any danger coming your way. Has anyone experienced stuff like that in the game? Did you beat it in a quick or fair amount of time? Im just wondering because this is my first Kingdom Hearts game I bought. I watched walkthroughs of the other games since I wasn't able to buy them. Thank you!