Scaler

Pause the game play, then go to main menu and choose the "Audio" option.
After enter the following button combinations:
Note: You will see a message, once a codes are accepted.

Full health:
Press R, L, R, L, X, X, B, B, R, B.

200,000 Klokkies:
Press L, L, R, R, X, B, X.

Infinite Electric Bombs:
Press R, R, L, L, X, X, B.

Alternate ending:
Find all 100 Orbs and finish the game.

Fill Electric Bombs faster:
While you are on the vines Hold B

Faster credits:
While viewing the credits Hold R