This page will be for explaining general mechanics and techniques that might be mentioned but not be fully explained in the guide for your desired category.
Mechanics and Tech
Goal Games
Door Entrances
Full Jumps vs Non Full Jumps
When you you jump in this game, if you don't do a full jump (holding A all the way through until the start of Kirby's descent) you will freeze in the air for a single frame. This frame is basically never noticeable and hardly matters, but you can technically shave off frames by trying to reduce the amount of times you jump or changing those jumps to full jumps.
Video example and explanation: