Yea, the ending credits on true end.... I was not expecting that at all, couldn't stop laughing.
I started playing again after my break to try and grind for some of the trophies, and man, I didn't think getting to lv99 would take so damn long. I'm getting close now, but at the same time, I am lvling other mirages too for the most grindy trophy, but still kinda thought I'd be 99 long time ago.
The post game dungeons are pretty short sadly, nothing special, either. You get a exp boost mirajewel at the beginning of one of them, but the boost is incredibly small, seems to be around 5%.