From Before I Play
- The time limit isn't too bad, just try to get at least one part a day (though don't worry if you can't occasionally)
- After you get Blue Pikmin, try to stick to one area until you clean out all the parts from that area. Because enemies will respawn after enough days have passed.
- I somehow missed this so you might too. Pikmin who are with you, near your rocket, or in the ground won't die when night comes. But you'll automatically go back to your rocket when the day ends so don't worry about going too far out.
- If you're REALLY hurting for Pikmin there are pearls in the tutorial area that give you a bunch, but you need Blue Pikmin to get to them.