Whispy Woods is a staple to the Kirby series, I can’t think of any game where he isn’t the first boss. And fittingly enough, he’s the first boss of the whole series too.
Since Kirby can’t actually absorb powers in the first Kirby’s Dream Land, you don’t have a lot to fight him. You have to dodge his wind gusts.
And avoid the apples while using them to be your ammo to attack the mean tree.
It’s an enjoyable little battle.