Suffering from post-Frebbventure depression? It's been known to happen, but now you needn't suffer anymore! Go on, give it a look!
What's new? What's different? Nothing, but also everything. It's the exact same formula you loved the first time, but faster, smoother, prettier... good music-ier, and even more jam packed than last time. More enemies, more bosses, more level variety, more platforming mechanics, and more playable characters with more customization.
The biggest changes to the formula are that you now control a tag team of two characters at the same time (DKC style, there's no weird gimmicks or shoddy follower AI getting in the way,) and that the the bonus objective system has been replaced with slightly more standard collectable crystals and a style/ranking system based on avoiding damage and chaining together currency pickups and enemy KOs.
(Don't worry if you get a C rank or lower on your first passthrough; it's meant to be a VERY strict system. Even I can barely get an S rank on most levels!)