User blog comment:Ahomeschoolingroudon/All A Board The Meme Train!/@comment-24281142-20150311215816/@comment-24281142-20150312020431

In order to be a galaxy-buster, he'd of had to destroy the entire galaxy at once. Individually going from planet to planet and destroying them one at a time makes him planet level, not galaxy level.

But even if he was whatever-the-hell level, it doesn't matter with Kirby. Any projectiles attacks can be easily rebounded, and Buu can NOT kill him with punches or kicks. And even low-ball calcs leave the Warp Star at 3x the SOL, so really the chances of Buu hitting Kirby are pretty slim.