Restore energy:
Enter JUGGLERS as a name at the high score screen. Begin game play again, then enter ANNFRANK as a name at the high score screen. 

Larger energy bar:
Enter JUGGLERS as a name at the high score screen. Begin game play again, then enter LUMBJACK as a name at the high score screen. 

Three weapon power bars:
Enter JUGGLERS as a name at the high score screen. Begin game play again, then enter HEINZ as a name at the high score screen. 

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

POKE 22281,173 
Unlimited energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 5948,173