Identifying That GameCube Game: Little Leaf-Headed Guys? It's Pikmin!
You are almost certainly describing Pikmin (2001) or its sequel Pikmin 2 (2004) on Nintendo GameCube.
Why It Matches
"Little Guys": Pikmin are tiny (1cm), plant-animal hybrids you command in squads of 100.
"Leaves on Their Heads": Each Pikmin has a stem topped by a Leaf, Bud, or Flower indicating maturity/speed (Leaf=slowest, Flower=fastest).
Gameplay: You play as Captain Olimar (Hocotatian), stranded on an Earth-like planet (PNF-404). Direct Pikmin to carry ship parts, defeat beasts, solve puzzles. Real-time strategy with a cute/brutal tone.
Time Limit: 30 in-game days (≈13 min each) to recover 30 ship parts in Pikmin 1.
Can You Play It on PC?
Officially: NO. Nintendo has never released Pikmin 1 or 2 on PC.
Via Emulation (Legal Grey Area):Dolphin Emulator (Windows/Linux/macOS/Android) runs both games flawlessly at 4K/60FPS/16:9, with HD texture packs, widescreen hacks, and keyboard/mouse or controller support. You must dump your own GameCube discs and BIOS for legality.
Nintendo Switch:Pikmin 1+2 (2023 Remaster) — HD graphics, gyro/pointer controls, all DLC, difficulty options. Best way to play today.Pikmin 3 Deluxe & Pikmin 4 also on Switch.
Other "Leaf-Head" Possibilities
Yoshi's Island (SNES/GBA): Yoshi carries babies; some enemies (e.g., Naval Piranha) have leafy parts.
The Legend of Zelda: The Wind Waker (GC): Koroks have leaf masks; Deku Tree / Forest Haven aesthetic.
Chibi-Robo! (GC): Tiny robot; not leaf-headed.
If it had a day/night cycle, onion spaceships, and carrying numbered pellets — it's definitely Pikmin.