For the unlockables below, you have to get the specified score or higher to get 
the unlockable:

Effect            - Code
------------------------------------
Alternate Costume - Kameo - 100,000 
Cheats Set #1 - 2,500,000 
Concept Video - 1,500,000 
Making Backgrounds Video - 500,000 
Test Cutscene - 2,000,000 
Troll Song - 1,000,000 

Water Temple High Score
For the unlockables below, you have to get the specified score or higher to get 
the unlockable:

Effect - Code
-------------------------------------
Alternate Costume - Ash - 1,000,000 
Alternate Costume - Kameo - 500,000 
Alternate Costume - Major Ruin - 2,000,000 
Boss Fights - 2,500,000 
Cheat Set #3 - 3,000,000 
Cutscene Videos - 1,500,000