Grow Island creates several different island structures and activities as you press each of the 8 buttons in order, corresponding to types of engineering.
Regular Ending (all levels max)
1. Mechanical Engineering - Bolt - 8
2. Civil Engineering - Pick Axe - 3
3. Architecture - Logs - 6
4. Aeronautics, Marine, Automotive Engineering - Steering Wheel - 5
5. Environmental Engineering - Smokestack - 7
6. Electrical Engineering - Battery - 1
7. Computer Science - Chip - 2
8. Applied Chemistry - Burner/Candle - 4
UFO Ending
1. Aeronautics, Marine, Automotive Engineering - Steering Wheel - 5
2. Civil Engineering - Pick Axe -3
3. Architecture - Logs - 6
4. Computer Science - Chip - 2
5. Electrical Engineering - Battery - 1
6. Mechanical Engineering - Bolt - 8
7. Applied Chemistry - Burner/Candle - 4
8. Environmental Engineering - Smokestack - 7
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There is no secret ending. (the 3 games that do are Grow version 3, Grow Island, and Grow Valley)
No there is not.
U.F.O ending is on "Grow Island." Grow Valley has the underground alternate ending: 1. Magnifying glass 2. Gear 3. Heart 4. Computer Chip 5. Compass (or is it a surveyor's transit?) 6. Pickaxe 7. Beaker
There is no known security code on Nabooti Island.
This could refer to the game "Grow Cube" (see related question).