|At first, this seems about as easy as the 3D Kirby stages in Planet Robobot. I feel like I could probably get the platinum score pretty quickly with a bit of practice... Then once you get to the 2nd world, it becomes a bit more complex, and I can only get the gold score even when I seem to be doing everything perfectly. The 3rd and 4th worlds start to get moderately hard, but I can still get a gold on my first try on every stage...|
For every world, there's also an "EX" world that you can unlock by getting a gold score or better on every stage of that world. The EX world is like remixed stages from that world but with harder enemy arrangements and a different stage color pallet. The stages are similar but different enough to feel like extra content.
Then starting in 4-EX and the 5th world, getting a gold sometimes requires me to beat the stage a couple times... The boss of world 5-ex, a harder version of the Dedede fight, I actually died on that a few times. It's pretty tough to suck up and shoot the stars at him while still avoiding the attacks.
Finally, getting all gold scores or higher on every stage in the main worlds and EX worlds, unlocks the ultimate challenge world, "The Secret Path". This world is crazy hard. It's a guantlet of 5 stages that remix each of the 5 worlds, with really difficult enemy arrangements and harder versions of the bosses, and there's no healing or saving between stages.