How do you beat grow island

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