Currently the only cateogry is Any%, which is beating the game. Golderzoa and I have discussed what other categories should be on here.
2 main ideas: Stay unarbitary and Keep close to Dedede's Drum Dash Deluxe (which works very similar to this game).
Any%: Reach credits by beating the final level. We've already discussed timing and we've concluded pressing "A" to activate the credits.
Secret Ending: This game has 2 set of credits. Any% gets the first one by beating 5-5. There is another set of credits you can get by beating Secret World / Path. This is done by getting a gold medal in every normal and ex level. This serves as a middle category where you also play every level, unlike any%. It also focuses on different starts in normal world as well, different to any%. Dedede's Drum Dash Deluxe also has a 2nd set of credits just like this. "Secret Ending" isn't the official name, but seeing as how both games you need to beat levels that have "secret" in their name we've decided to keep with the name. Time ends the same as Any%
All Platinum Medals: Technically this is actually All Platinum Trophies, but Platinum Medals make the goal seem more obvious. This is meant to be the "100%". There is no actual 100% in this game due to no % counter like in other Kirby games. No Amiibos either because that adds nothing to the run. This also serves as sort of a "challenge" cateogry seeing as how difficult it would be to get a good run. Time ends at the Last Platinum Trophy appearing on screen.
Of course not all of these rules are perfect. If you have any other ideas, or want to input something on these rules, add here. If you have an idea or input for Dedede's Drum Dash Deluxe aswell add in the Dedede's Drum Dash Deluxe forum.