They could make a fun little pikmin spin-off, like a platformer where you're a pikmin that doesn't get found by olimer and you have to survive the world and something something...I don't know, I don't really have ideas for a story, but I feel like it could be fun to play as an individual pikmin. There could be puzzles based around finding those flower things that change your color, where you have to change to yellow to jump higher or use a bomb, etc.