Hammer is still a good special attack. It just has to be used right. Though, I'd give more variations to it and Cutter(the cutter combo and boomerang blade).
This is asking for too much, but I would like to see a mode switch for 3 of the Pink Blob's abilities: Sword, Fighter, and Ninja. Something similar to Toro the Cat.
Other than those, there are two other things I can see. "Abilities" Kirby, where the Blob use the remaining of nearly all his abilities(except Bomb, which can be a part of Sword, as well as Backdrop, which can be a part of Fire) and "Kirby 64" which is the Blob using his combined abilities from The Crystal Shards.
He should look more determined.