Level skip:
Enter LIFE STILL GOES ON as a name at the high score screen. Then, press [F1] to pause game play and press [Cursor Left] to advance to the next level. After the next level loads, press [F1] to resume game play to press [Cursor Left] to advance again. 

Unlimited energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 11741,173 
Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 11783,173
POKE 12461,173