Kirby 64 is one of my favorite N64 games. Its a simple yet challenging game with a nice atmosphere that is just honestly, relaxing to play.
One of the best features of the game as I am sure everyone knows, is how you can combine abilities.
For me my favorite was always bomb + cutter = ninja bomb star of death.
I loved how when Kirby threw it you didn't actually see it get thrown, it just appears stuck to the enemy. When it sticks to the enemy theres half a second where it stops moving as if to realize "oh shiKABOOM"